Il y a bien un 'TestApp.exe' mais il ne se lance pas, 'failed to find Steam'. Gamersgate is the oldest Steam alternative on our list, and offers many of the same high-profile releases you'll find on Steam. Steam Spy automatically gathers data from Steam user profiles, analyzes it and presents in simple, yet beautiful, manner.
Steam/SteamVR technically does not need to run when launching OpenVR games, but highly recommended (room setup and config is pulled from there). If you cannot find it's uninstaller, then you may need to uninstall FlatOut 2 to completely delete FlatOut2.exe. steam_api64.dll, File description: Steam Client API Errors related to steam_api64.dll can arise for a few different different reasons.