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Does the game show as in your Steam library even though no window appears?
If the error persists after trying these steps, your next logical step is to check if you have any lingering third-party mods installed that might be breaking the game's startup sequence. Would you like instructions on how to or learn how to manually re-register the Steam API DLL file ? Devil May Cry 5 - General Troubleshooting Guide - Steam
: In Steam, right-click the game, select Properties > Installed Files , and click Verify integrity of game files to repair corrupted data. Direct File Fixes
For an enhanced experience beyond just getting the game to run, the community has developed some excellent tools:
This is the most reliable fix for this specific error. The game needs to know which Steam AppID it belongs to.
To fix the "Steam must be running to play this game" error in DmC: Devil May Cry , you need to resolve a communication failure between the game launcher and your Steam client. This issue usually happens due to missing administrative privileges, corrupted game files, or overly aggressive antivirus software blocking the game's executable.