Without an active AppID, Fusion will still let you place the Steamworks object in your project, but any attempt to run the game will result in the same “Cannot load Steamworks.mfx” error that players see.
Because the extension initialises by connecting to the Steam client, attempting to run a game without Steam open, or from a standalone shortcut that bypasses Steam, will trigger the error. This is by design.
I have broken this down into marketing copy, feature lists, technical specs, and promotional assets.
Updating what a user is doing in the game to show to their friends list. 3. Simplified Steam Workshop Handling