Disallow Legendary on Windows to fix Heroic

src/main.py

@@ -19,6 +19,7 @@
 
 import json
 import lzma
+import os
 import sys
 
 import gi
@@ -65,6 +66,12 @@ class CartridgesApplication(Adw.Application):
     def do_activate(self):  # pylint: disable=arguments-differ
         """Called on app creation"""
 
+        setup_logging()
+        log_system_info()
+
+        if os.name == "nt":
+            migrate_files_v1_to_v2()
+
         # Set fallback icon-name
         Gtk.Window.set_default_icon_name(shared.APP_ID)
 
@@ -280,8 +287,5 @@ class CartridgesApplication(Adw.Application):
 
 def main(_version):
     """App entry point"""
-    setup_logging()
-    log_system_info()
-    migrate_files_v1_to_v2()
     app = CartridgesApplication()
     return app.run(sys.argv)