Before launching the game, check if the steam.exe process is active.

If you are encountering this error while trying to launch a game, try these steps in order:

To resolve the steamworks.mfx error, try the following solutions:

The error is a Windows system error, nor is it related to Valve’s Steam client directly. Instead, it is an issue within the Clickteam Fusion ecosystem.

In feed #7, the tape was off.

If you are a looking to fix this in your own Clickteam project, ensure that the Steamworks.mfx file is included in your build folder and that the Steam SDK is correctly linked in your application properties.