If you need a desktop shortcut, create it via Steam: Right-click the game in your library → Manage → Add desktop shortcut.
The game engine used for Marvel vs. Capcom 3 has a known bug where it fails to initialize the Steam API if the installation file path contains spaces or special characters. steam api is not initialized marvel vs capcom 3
If the steam_api64.dll is missing or altered, Steam will restore it. If you need a desktop shortcut, create it
Many mods replace the game’s .exe or use a DLL injector that doesn't pass the correct Steam launch parameters. If you need a desktop shortcut
Modding UMvC3 is popular, but many mods break the API initialization. Here is how to fix it without giving up your mods.