diff --git a/src/importer/sources/bottles_source.py b/src/importer/sources/bottles_source.py
index da70df6..d77bee3 100644
--- a/src/importer/sources/bottles_source.py
+++ b/src/importer/sources/bottles_source.py
@@ -6,12 +6,15 @@ import yaml
 from src import shared
 from src.game import Game
 from src.importer.sources.source import (
-    LinuxSource,
-    Source,
     SourceIterationResult,
     SourceIterator,
+    URLExecutableSource,
+)
+from src.utils.decorators import (
+    replaced_by_env_path,
+    replaced_by_path,
+    replaced_by_schema_key,
 )
-from src.utils.decorators import replaced_by_env_path, replaced_by_path
 
 
 class BottlesSourceIterator(SourceIterator):
@@ -49,22 +52,16 @@ class BottlesSourceIterator(SourceIterator):
             yield (game, additional_data)
 
 
-class BottlesSource(Source):
+class BottlesSource(URLExecutableSource):
     """Generic Bottles source"""
 
     name = "Bottles"
-    location_key = "bottles-location"
-
-    def __iter__(self) -> SourceIterator:
-        return BottlesSourceIterator(self)
-
-
-class BottlesLinuxSource(BottlesSource, LinuxSource):
-    variant = "linux"
-    executable_format = 'xdg-open bottles:run/"{bottle_name}"/"{game_name}"'
+    iterator_class = BottlesSourceIterator
+    url_format = 'bottles:run/"{bottle_name}"/"{game_name}"'
+    available_on = set(("linux",))
 
     @property
-    @BottlesSource.replaced_by_schema_key()
+    @replaced_by_schema_key
     @replaced_by_path("~/.var/app/com.usebottles.bottles/data/bottles/")
     @replaced_by_env_path("XDG_DATA_HOME", "bottles/")
     @replaced_by_path("~/.local/share/bottles/")
diff --git a/src/importer/sources/heroic_source.py b/src/importer/sources/heroic_source.py
index 4d74ae7..01faf24 100644
--- a/src/importer/sources/heroic_source.py
+++ b/src/importer/sources/heroic_source.py
@@ -9,13 +9,15 @@ from typing import Optional, TypedDict
 from src import shared
 from src.game import Game
 from src.importer.sources.source import (
-    LinuxSource,
-    Source,
+    URLExecutableSource,
     SourceIterationResult,
     SourceIterator,
-    WindowsSource,
 )
-from src.utils.decorators import replaced_by_env_path, replaced_by_path
+from src.utils.decorators import (
+    replaced_by_env_path,
+    replaced_by_path,
+    replaced_by_schema_key,
+)
 
 
 class HeroicLibraryEntry(TypedDict):
@@ -112,40 +114,24 @@ class HeroicSourceIterator(SourceIterator):
                 yield result
 
 
-class HeroicSource(Source):
+class HeroicSource(URLExecutableSource):
     """Generic heroic games launcher source"""
 
     name = "Heroic"
-    location_key = "heroic-location"
+    iterator_class = HeroicSourceIterator
+    url_format = "heroic://launch/{app_name}"
+    available_on = set(("linux", "win32"))
 
     @property
     def game_id_format(self) -> str:
         """The string format used to construct game IDs"""
         return self.name.lower() + "_{service}_{game_id}"
 
-    def __iter__(self):
-        return HeroicSourceIterator(source=self)
-
-
-class HeroicLinuxSource(HeroicSource, LinuxSource):
-    variant = "linux"
-    executable_format = "xdg-open heroic://launch/{app_name}"
-
     @property
-    @HeroicSource.replaced_by_schema_key()
+    @replaced_by_schema_key
     @replaced_by_path("~/.var/app/com.heroicgameslauncher.hgl/config/heroic/")
     @replaced_by_env_path("XDG_CONFIG_HOME", "heroic/")
     @replaced_by_path("~/.config/heroic/")
-    def location(self) -> Path:
-        raise FileNotFoundError()
-
-
-class HeroicWindowsSource(HeroicSource, WindowsSource):
-    variant = "windows"
-    executable_format = "start heroic://launch/{app_name}"
-
-    @property
-    @HeroicSource.replaced_by_schema_key()
     @replaced_by_env_path("appdata", "heroic/")
     def location(self) -> Path:
         raise FileNotFoundError()
diff --git a/src/importer/sources/itch_source.py b/src/importer/sources/itch_source.py
index 5682f03..29ef507 100644
--- a/src/importer/sources/itch_source.py
+++ b/src/importer/sources/itch_source.py
@@ -5,13 +5,15 @@ from time import time
 from src import shared
 from src.game import Game
 from src.importer.sources.source import (
-    LinuxSource,
-    Source,
     SourceIterationResult,
     SourceIterator,
-    WindowsSource,
+    URLExecutableSource,
+)
+from src.utils.decorators import (
+    replaced_by_env_path,
+    replaced_by_path,
+    replaced_by_schema_key,
 )
-from src.utils.decorators import replaced_by_env_path, replaced_by_path
 
 
 class ItchSourceIterator(SourceIterator):
@@ -54,33 +56,17 @@ class ItchSourceIterator(SourceIterator):
             yield (game, additional_data)
 
 
-class ItchSource(Source):
+class ItchSource(URLExecutableSource):
     name = "Itch"
-    location_key = "itch-location"
-
-    def __iter__(self) -> SourceIterator:
-        return ItchSourceIterator(self)
-
-
-class ItchLinuxSource(ItchSource, LinuxSource):
-    variant = "linux"
-    executable_format = "xdg-open itch://caves/{cave_id}/launch"
+    iterator_class = ItchSourceIterator
+    url_format = "itch://caves/{cave_id}/launch"
+    available_on = set(("linux", "win32"))
 
     @property
-    @ItchSource.replaced_by_schema_key()
+    @replaced_by_schema_key
     @replaced_by_path("~/.var/app/io.itch.itch/config/itch/")
     @replaced_by_env_path("XDG_DATA_HOME", "itch/")
     @replaced_by_path("~/.config/itch")
-    def location(self) -> Path:
-        raise FileNotFoundError()
-
-
-class ItchWindowsSource(ItchSource, WindowsSource):
-    variant = "windows"
-    executable_format = "start itch://caves/{cave_id}/launch"
-
-    @property
-    @ItchSource.replaced_by_schema_key()
     @replaced_by_env_path("appdata", "itch/")
     def location(self) -> Path:
         raise FileNotFoundError()
diff --git a/src/importer/sources/legendary_source.py b/src/importer/sources/legendary_source.py
index bbc5b5e..91f8b0a 100644
--- a/src/importer/sources/legendary_source.py
+++ b/src/importer/sources/legendary_source.py
@@ -1,19 +1,18 @@
-import logging
-from pathlib import Path
-from typing import Generator
 import json
+import logging
 from json import JSONDecodeError
+from pathlib import Path
 from time import time
+from typing import Generator
 
 from src import shared
 from src.game import Game
-from src.importer.sources.source import (
-    LinuxSource,
-    Source,
-    SourceIterationResult,
-    SourceIterator,
+from src.importer.sources.source import Source, SourceIterationResult, SourceIterator
+from src.utils.decorators import (
+    replaced_by_env_path,
+    replaced_by_path,
+    replaced_by_schema_key,
 )
-from src.utils.decorators import replaced_by_env_path, replaced_by_path
 
 
 class LegendarySourceIterator(SourceIterator):
@@ -74,22 +73,14 @@ class LegendarySourceIterator(SourceIterator):
 
 class LegendarySource(Source):
     name = "Legendary"
-    location_key = "legendary-location"
-
-    def __iter__(self) -> SourceIterator:
-        return LegendarySourceIterator(self)
-
-
-# TODO add Legendary windows variant
-
-
-class LegendaryLinuxSource(LegendarySource, LinuxSource):
-    variant = "linux"
     executable_format = "legendary launch {app_name}"
+    iterator_class = LegendarySourceIterator
+    available_on = set(("linux", "win32"))
 
     @property
-    @LegendarySource.replaced_by_schema_key()
+    @replaced_by_schema_key
     @replaced_by_env_path("XDG_CONFIG_HOME", "legendary/")
     @replaced_by_path("~/.config/legendary/")
+    @replaced_by_path("~\\.config\\legendary\\")
     def location(self) -> Path:
         raise FileNotFoundError()
diff --git a/src/importer/sources/lutris_source.py b/src/importer/sources/lutris_source.py
index 641b75f..7a2e51d 100644
--- a/src/importer/sources/lutris_source.py
+++ b/src/importer/sources/lutris_source.py
@@ -4,12 +4,11 @@ from time import time
 from src import shared
 from src.game import Game
 from src.importer.sources.source import (
-    LinuxSource,
-    Source,
     SourceIterationResult,
     SourceIterator,
+    URLExecutableSource,
 )
-from src.utils.decorators import replaced_by_path
+from src.utils.decorators import replaced_by_path, replaced_by_schema_key
 
 
 class LutrisSourceIterator(SourceIterator):
@@ -47,7 +46,6 @@ class LutrisSourceIterator(SourceIterator):
                     game_id=row[2], game_internal_id=row[0]
                 ),
                 "executable": self.source.executable_format.format(game_id=row[2]),
-                "developer": None,  # TODO get developer metadata on Lutris
             }
             game = Game(values, allow_side_effects=False)
 
@@ -59,26 +57,20 @@ class LutrisSourceIterator(SourceIterator):
             yield (game, additional_data)
 
 
-class LutrisSource(Source):
+class LutrisSource(URLExecutableSource):
     """Generic lutris source"""
 
     name = "Lutris"
-    location_key = "lutris-location"
+    iterator_class = LutrisSourceIterator
+    url_format = "lutris:rungameid/{game_id}"
+    available_on = set(("linux",))
 
     @property
     def game_id_format(self):
         return super().game_id_format + "_{game_internal_id}"
 
-    def __iter__(self):
-        return LutrisSourceIterator(source=self)
-
-
-class LutrisLinuxSource(LutrisSource, LinuxSource):
-    variant = "linux"
-    executable_format = "xdg-open lutris:rungameid/{game_id}"
-
     @property
-    @LutrisSource.replaced_by_schema_key()
+    @replaced_by_schema_key
     @replaced_by_path("~/.var/app/net.lutris.Lutris/data/lutris/")
     @replaced_by_path("~/.local/share/lutris/")
     def location(self):
diff --git a/src/importer/sources/source.py b/src/importer/sources/source.py
index 1df02b1..16963dc 100644
--- a/src/importer/sources/source.py
+++ b/src/importer/sources/source.py
@@ -1,13 +1,11 @@
 import sys
 from abc import abstractmethod
 from collections.abc import Iterable, Iterator
-from functools import wraps
 from pathlib import Path
-from typing import Generator, Any, TypedDict
+from typing import Generator, Any
 
 from src import shared
 from src.game import Game
-from src.utils.decorators import replaced_by_path
 
 # Type of the data returned by iterating on a Source
 SourceIterationResult = None | Game | tuple[Game, tuple[Any]]
@@ -45,13 +43,9 @@ class Source(Iterable):
     """Source of games. E.g an installed app with a config file that lists game directories"""
 
     name: str
-    variant: str
-    location_key: str
-    available_on: set[str]
-
-    def __init__(self) -> None:
-        super().__init__()
-        self.available_on = set()
+    iterator_class: type[SourceIterator]
+    variant: str = None
+    available_on: set[str] = set()
 
     @property
     def full_name(self) -> str:
@@ -83,6 +77,14 @@ class Source(Iterable):
             return False
         return sys.platform in self.available_on
 
+    @property
+    def location_key(self) -> str:
+        """
+        The schema key pointing to the user-set location for the source.
+        May be overriden by inherinting classes.
+        """
+        return f"{self.name.lower()}-location"
+
     def update_location_schema_key(self):
         """Update the schema value for this source's location if possible"""
         try:
@@ -91,19 +93,9 @@ class Source(Iterable):
             return
         shared.schema.set_string(self.location_key, location)
 
-    @classmethod
-    def replaced_by_schema_key(cls):  # Decorator builder
-        """Replace the returned path with schema's path if valid"""
-
-        def decorator(original_function):  # Built decorator (closure)
-            @wraps(original_function)
-            def wrapper(*args, **kwargs):  # func's override
-                override = shared.schema.get_string(cls.location_key)
-                return replaced_by_path(override)(original_function)(*args, **kwargs)
-
-            return wrapper
-
-        return decorator
+    def __iter__(self) -> SourceIterator:
+        """Get an iterator for the source"""
+        return self.iterator_class(self)
 
     @property
     @abstractmethod
@@ -115,22 +107,21 @@ class Source(Iterable):
     def executable_format(self) -> str:
         """The executable format used to construct game executables"""
 
-    @abstractmethod
-    def __iter__(self) -> SourceIterator:
-        """Get the source's iterator, to use in for loops"""
 
+# pylint: disable=abstract-method
+class URLExecutableSource(Source):
+    """Source class that use custom URLs to start games"""
 
-class WindowsSource(Source):
-    """Mixin for sources available on Windows"""
+    url_format: str
 
-    def __init__(self) -> None:
-        super().__init__()
-        self.available_on.add("win32")
-
-
-class LinuxSource(Source):
-    """Mixin for sources available on Linux"""
-
-    def __init__(self) -> None:
-        super().__init__()
-        self.available_on.add("linux")
+    @property
+    def executable_format(self) -> str:
+        match sys.platform:
+            case "win32":
+                return "start " + self.url_format
+            case "linux":
+                return "xdg-open " + self.url_format
+            case other:
+                raise NotImplementedError(
+                    f"No URL handler command available for {other}"
+                )
diff --git a/src/importer/sources/steam_source.py b/src/importer/sources/steam_source.py
index 9c6488c..7e724ab 100644
--- a/src/importer/sources/steam_source.py
+++ b/src/importer/sources/steam_source.py
@@ -6,14 +6,16 @@ from typing import Iterable
 from src import shared
 from src.game import Game
 from src.importer.sources.source import (
-    LinuxSource,
-    Source,
     SourceIterationResult,
     SourceIterator,
-    WindowsSource,
+    URLExecutableSource,
 )
-from src.utils.decorators import replaced_by_env_path, replaced_by_path
-from src.utils.steam import SteamHelper, SteamInvalidManifestError
+from src.utils.decorators import (
+    replaced_by_env_path,
+    replaced_by_path,
+    replaced_by_schema_key,
+)
+from src.utils.steam import SteamFileHelper, SteamInvalidManifestError
 
 
 class SteamSourceIterator(SourceIterator):
@@ -22,11 +24,11 @@ class SteamSourceIterator(SourceIterator):
     def get_manifest_dirs(self) -> Iterable[Path]:
         """Get dirs that contain steam app manifests"""
         libraryfolders_path = self.source.location / "steamapps" / "libraryfolders.vdf"
-        with open(libraryfolders_path, "r") as file:
+        with open(libraryfolders_path, "r", encoding="utf-8") as file:
             contents = file.read()
         return [
             Path(path) / "steamapps"
-            for path in re.findall('"path"\s+"(.*)"\n', contents, re.IGNORECASE)
+            for path in re.findall('"path"\\s+"(.*)"\n', contents, re.IGNORECASE)
         ]
 
     def get_manifests(self) -> Iterable[Path]:
@@ -50,15 +52,15 @@ class SteamSourceIterator(SourceIterator):
         manifests = self.get_manifests()
         for manifest in manifests:
             # Get metadata from manifest
-            steam = SteamHelper()
+            steam = SteamFileHelper()
             try:
                 local_data = steam.get_manifest_data(manifest)
             except (OSError, SteamInvalidManifestError):
                 continue
 
             # Skip non installed games
-            INSTALLED_MASK: int = 4
-            if not int(local_data["stateflags"]) & INSTALLED_MASK:
+            installed_mask = 4
+            if not int(local_data["stateflags"]) & installed_mask:
                 continue
 
             # Skip duplicate appids
@@ -85,40 +87,24 @@ class SteamSourceIterator(SourceIterator):
                 / "librarycache"
                 / f"{appid}_library_600x900.jpg"
             )
-            additional_data = {"local_image_path": image_path}
+            additional_data = {"local_image_path": image_path, "steam_appid": appid}
 
             # Produce game
             yield (game, additional_data)
 
 
-class SteamSource(Source):
+class SteamSource(URLExecutableSource):
     name = "Steam"
-    location_key = "steam-location"
-
-    def __iter__(self):
-        return SteamSourceIterator(source=self)
-
-
-class SteamLinuxSource(SteamSource, LinuxSource):
-    variant = "linux"
-    executable_format = "xdg-open steam://rungameid/{game_id}"
+    iterator_class = SteamSourceIterator
+    url_format = "steam://rungameid/{game_id}"
+    available_on = set(("linux", "win32"))
 
     @property
-    @SteamSource.replaced_by_schema_key()
+    @replaced_by_schema_key
     @replaced_by_path("~/.var/app/com.valvesoftware.Steam/data/Steam/")
     @replaced_by_env_path("XDG_DATA_HOME", "Steam/")
     @replaced_by_path("~/.steam/")
     @replaced_by_path("~/.local/share/Steam/")
-    def location(self):
-        raise FileNotFoundError()
-
-
-class SteamWindowsSource(SteamSource, WindowsSource):
-    variant = "windows"
-    executable_format = "start steam://rungameid/{game_id}"
-
-    @property
-    @SteamSource.replaced_by_schema_key()
     @replaced_by_env_path("programfiles(x86)", "Steam")
     def location(self):
         raise FileNotFoundError()
diff --git a/src/main.py b/src/main.py
index 52dd8e5..5cd8dc3 100644
--- a/src/main.py
+++ b/src/main.py
@@ -34,12 +34,12 @@ from src import shared
 from src.details_window import DetailsWindow
 from src.game import Game
 from src.importer.importer import Importer
-from src.importer.sources.bottles_source import BottlesLinuxSource
-from src.importer.sources.heroic_source import HeroicLinuxSource, HeroicWindowsSource
-from src.importer.sources.itch_source import ItchLinuxSource, ItchWindowsSource
-from src.importer.sources.legendary_source import LegendaryLinuxSource
-from src.importer.sources.lutris_source import LutrisLinuxSource
-from src.importer.sources.steam_source import SteamLinuxSource, SteamWindowsSource
+from src.importer.sources.bottles_source import BottlesSource
+from src.importer.sources.heroic_source import HeroicSource
+from src.importer.sources.itch_source import ItchSource
+from src.importer.sources.legendary_source import LegendarySource
+from src.importer.sources.lutris_source import LutrisSource
+from src.importer.sources.steam_source import SteamSource
 from src.preferences import PreferencesWindow
 from src.store.managers.display_manager import DisplayManager
 from src.store.managers.file_manager import FileManager
@@ -190,21 +190,25 @@ class CartridgesApplication(Adw.Application):
 
     def on_import_action(self, *_args):
         importer = Importer()
+
         if shared.schema.get_boolean("lutris"):
-            importer.add_source(LutrisLinuxSource())
+            importer.add_source(LutrisSource())
+
         if shared.schema.get_boolean("steam"):
-            importer.add_source(SteamLinuxSource())
-            importer.add_source(SteamWindowsSource())
+            importer.add_source(SteamSource())
+
         if shared.schema.get_boolean("heroic"):
-            importer.add_source(HeroicLinuxSource())
-            importer.add_source(HeroicWindowsSource())
+            importer.add_source(HeroicSource())
+
         if shared.schema.get_boolean("bottles"):
-            importer.add_source(BottlesLinuxSource())
+            importer.add_source(BottlesSource())
+
         if shared.schema.get_boolean("itch"):
-            importer.add_source(ItchLinuxSource())
-            importer.add_source(ItchWindowsSource())
+            importer.add_source(ItchSource())
+
         if shared.schema.get_boolean("legendary"):
-            importer.add_source(LegendaryLinuxSource())
+            importer.add_source(LegendarySource())
+
         importer.run()
 
     def on_remove_game_action(self, *_args):
diff --git a/src/store/managers/async_manager.py b/src/store/managers/async_manager.py
index 636b2bd..373d51f 100644
--- a/src/store/managers/async_manager.py
+++ b/src/store/managers/async_manager.py
@@ -34,7 +34,7 @@ class AsyncManager(Manager):
         task.set_task_data((game, additional_data))
         task.run_in_thread(self._task_thread_func)
 
-    def _task_thread_func(self, _task, _source_object, data, cancellable):
+    def _task_thread_func(self, _task, _source_object, data, _cancellable):
         """Task thread entry point"""
         game, additional_data, *_rest = data
         self.execute_resilient_manager_logic(game, additional_data)
diff --git a/src/store/managers/itch_cover_manager.py b/src/store/managers/itch_cover_manager.py
index 79506ea..3abc474 100644
--- a/src/store/managers/itch_cover_manager.py
+++ b/src/store/managers/itch_cover_manager.py
@@ -2,13 +2,12 @@ from pathlib import Path
 
 import requests
 from gi.repository import GdkPixbuf, Gio
-from requests import HTTPError
-from urllib3.exceptions import SSLError
+from requests.exceptions import HTTPError, SSLError
 
 from src import shared
 from src.game import Game
-from src.store.managers.manager import Manager
 from src.store.managers.local_cover_manager import LocalCoverManager
+from src.store.managers.manager import Manager
 from src.utils.save_cover import resize_cover, save_cover
 
 
@@ -45,7 +44,7 @@ class ItchCoverManager(Manager):
             GdkPixbuf.InterpType.BILINEAR,
         )
 
-        # Composite 
+        # Composite
         itch_pixbuf.composite(
             game_cover,
             0,
diff --git a/src/store/managers/manager.py b/src/store/managers/manager.py
index 6d82f61..e5581b7 100644
--- a/src/store/managers/manager.py
+++ b/src/store/managers/manager.py
@@ -64,7 +64,7 @@ class Manager:
         """Execute the manager logic and handle its errors by reporting them or retrying"""
         try:
             self.manager_logic(game, additional_data)
-        except Exception as error:
+        except Exception as error:  # pylint: disable=broad-exception-caught
             logging_args = (
                 type(error).__name__,
                 self.name,
diff --git a/src/store/managers/online_cover_manager.py b/src/store/managers/online_cover_manager.py
index 40753a2..b4e5bf0 100644
--- a/src/store/managers/online_cover_manager.py
+++ b/src/store/managers/online_cover_manager.py
@@ -2,12 +2,11 @@ from pathlib import Path
 
 import requests
 from gi.repository import Gio
-from requests import HTTPError
-from urllib3.exceptions import SSLError
+from requests.exceptions import HTTPError, SSLError
 
 from src.game import Game
-from src.store.managers.manager import Manager
 from src.store.managers.local_cover_manager import LocalCoverManager
+from src.store.managers.manager import Manager
 from src.utils.save_cover import resize_cover, save_cover
 
 
diff --git a/src/store/managers/sgdb_manager.py b/src/store/managers/sgdb_manager.py
index 08cfa88..c1831fc 100644
--- a/src/store/managers/sgdb_manager.py
+++ b/src/store/managers/sgdb_manager.py
@@ -1,18 +1,20 @@
-from urllib3.exceptions import SSLError
+from json import JSONDecodeError
+
+from requests.exceptions import HTTPError, SSLError
 
 from src.game import Game
 from src.store.managers.async_manager import AsyncManager
 from src.store.managers.itch_cover_manager import ItchCoverManager
 from src.store.managers.local_cover_manager import LocalCoverManager
 from src.store.managers.steam_api_manager import SteamAPIManager
-from src.utils.steamgriddb import HTTPError, SGDBAuthError, SGDBHelper
+from src.utils.steamgriddb import SGDBAuthError, SGDBHelper
 
 
 class SGDBManager(AsyncManager):
     """Manager in charge of downloading a game's cover from steamgriddb"""
 
     run_after = set((SteamAPIManager, LocalCoverManager, ItchCoverManager))
-    retryable_on = set((HTTPError, SSLError))
+    retryable_on = set((HTTPError, SSLError, ConnectionError, JSONDecodeError))
 
     def manager_logic(self, game: Game, _additional_data: dict) -> None:
         try:
diff --git a/src/store/managers/steam_api_manager.py b/src/store/managers/steam_api_manager.py
index 4f7d0c3..faad9d7 100644
--- a/src/store/managers/steam_api_manager.py
+++ b/src/store/managers/steam_api_manager.py
@@ -1,12 +1,12 @@
-from urllib3.exceptions import SSLError
+from requests.exceptions import HTTPError, SSLError
 
 from src.game import Game
 from src.store.managers.async_manager import AsyncManager
 from src.utils.steam import (
-    HTTPError,
     SteamGameNotFoundError,
-    SteamHelper,
+    SteamAPIHelper,
     SteamNotAGameError,
+    SteamRateLimiter,
 )
 
 
@@ -15,15 +15,22 @@ class SteamAPIManager(AsyncManager):
 
     retryable_on = set((HTTPError, SSLError))
 
-    def manager_logic(self, game: Game, _additional_data: dict) -> None:
+    steam_api_helper: SteamAPIHelper = None
+    steam_rate_limiter: SteamRateLimiter = None
+
+    def __init__(self) -> None:
+        super().__init__()
+        self.steam_rate_limiter = SteamRateLimiter()
+        self.steam_api_helper = SteamAPIHelper(self.steam_rate_limiter)
+
+    def manager_logic(self, game: Game, additional_data: dict) -> None:
         # Skip non-steam games
-        if not game.source.startswith("steam_"):
+        appid = additional_data.get("steam_appid", None)
+        if appid is None:
             return
         # Get online metadata
-        appid = str(game.game_id).split("_")[-1]
-        steam = SteamHelper()
         try:
-            online_data = steam.get_api_data(appid=appid)
+            online_data = self.steam_api_helper.get_api_data(appid=appid)
         except (SteamNotAGameError, SteamGameNotFoundError):
             game.update_values({"blacklisted": True})
         else:
diff --git a/src/utils/decorators.py b/src/utils/decorators.py
index f836945..09763fa 100644
--- a/src/utils/decorators.py
+++ b/src/utils/decorators.py
@@ -2,6 +2,8 @@ from pathlib import Path
 from os import PathLike, environ
 from functools import wraps
 
+from src import shared
+
 
 def replaced_by_path(override: PathLike):  # Decorator builder
     """Replace the method's returned path with the override
@@ -36,3 +38,18 @@ def replaced_by_env_path(env_var_name: str, suffix: PathLike | None = None):
         return wrapper
 
     return decorator
+
+
+def replaced_by_schema_key(original_method):  # Built decorator (closure)
+    """
+    Replace the original method's value by the path pointed at in the schema
+    by the class' location key (if that override exists)
+    """
+
+    @wraps(original_method)
+    def wrapper(*args, **kwargs):  # func's override
+        source = args[0]
+        override = shared.schema.get_string(source.location_key)
+        return replaced_by_path(override)(original_method)(*args, **kwargs)
+
+    return wrapper
diff --git a/src/utils/steam.py b/src/utils/steam.py
index 8008f77..517f9bf 100644
--- a/src/utils/steam.py
+++ b/src/utils/steam.py
@@ -4,7 +4,7 @@ import re
 from typing import TypedDict
 
 import requests
-from requests import HTTPError
+from requests.exceptions import HTTPError
 
 from src import shared
 from src.utils.rate_limiter import PickHistory, RateLimiter
@@ -27,7 +27,7 @@ class SteamInvalidManifestError(SteamError):
 
 
 class SteamManifestData(TypedDict):
-    """Dict returned by SteamHelper.get_manifest_data"""
+    """Dict returned by SteamFileHelper.get_manifest_data"""
 
     name: str
     appid: str
@@ -35,7 +35,7 @@ class SteamManifestData(TypedDict):
 
 
 class SteamAPIData(TypedDict):
-    """Dict returned by SteamHelper.get_api_data"""
+    """Dict returned by SteamAPIHelper.get_api_data"""
 
     developers: str
 
@@ -73,34 +73,35 @@ class SteamRateLimiter(RateLimiter):
         shared.state_schema.set_string("steam-limiter-tokens-history", timestamps_str)
 
 
-class SteamHelper:
-    """Helper around the Steam API"""
-
-    base_url = "https://store.steampowered.com/api"
-    rate_limiter: SteamRateLimiter = None
-
-    def __init__(self) -> None:
-        # Instanciate the rate limiter on the class to share across instances
-        # Can't be done at class creation time, schema isn't available yet
-        if self.__class__.rate_limiter is None:
-            self.__class__.rate_limiter = SteamRateLimiter()
+class SteamFileHelper:
+    """Helper for steam file formats"""
 
     def get_manifest_data(self, manifest_path) -> SteamManifestData:
         """Get local data for a game from its manifest"""
 
-        with open(manifest_path) as file:
+        with open(manifest_path, "r", encoding="utf-8") as file:
             contents = file.read()
 
         data = {}
 
-        for key in SteamManifestData.__required_keys__:
-            regex = f'"{key}"\s+"(.*)"\n'
+        for key in SteamManifestData.__required_keys__:  # pylint: disable=no-member
+            regex = f'"{key}"\\s+"(.*)"\n'
             if (match := re.search(regex, contents, re.IGNORECASE)) is None:
                 raise SteamInvalidManifestError()
             data[key] = match.group(1)
 
         return SteamManifestData(**data)
 
+
+class SteamAPIHelper:
+    """Helper around the Steam API"""
+
+    base_url = "https://store.steampowered.com/api"
+    rate_limiter: RateLimiter
+
+    def __init__(self, rate_limiter: RateLimiter) -> None:
+        self.rate_limiter = rate_limiter
+
     def get_api_data(self, appid) -> SteamAPIData:
         """
         Get online data for a game from its appid.
diff --git a/src/utils/steamgriddb.py b/src/utils/steamgriddb.py
index 3841e9b..5351898 100644
--- a/src/utils/steamgriddb.py
+++ b/src/utils/steamgriddb.py
@@ -3,7 +3,7 @@ from pathlib import Path
 
 import requests
 from gi.repository import Gio
-from requests import HTTPError
+from requests.exceptions import HTTPError
 
 from src import shared
 from src.utils.create_dialog import create_dialog