Question

I'm using Windows Vista and get an Error Code of RMN40 when I launch the game. What do I need to do?

Answer

Set GTA IV to Windows 2K compatibility mode.

  1. Locate the GTA IV directory

    • For Steam users, X:\Steam\steamapps\common\grand theft auto iv\GTAIV 

  2. Right click "LaunchGTAIV.exe" 

  3. Select "properties" 

  4. Select the "compatibility" tab 

  5. Tick "Run this program in compatibility mode for:" 

  6. Select "Windows 2000" 

  7. Press "OK" 

  8. Run the game from the "LaunchGTAIV" exe

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