Now go save Gotham. The city needs you.

If you're experiencing a fatal error with Batman: Arkham City, specifically mentioning a 'QA Approved Build' that was verified in January, here are some steps you might consider: The "Fatal Error

The "QA Approved" Nightmare: Fixing the Batman: Arkham City Fatal Error

If you are reading this, you have likely just experienced one of the most frustrating moments in PC gaming history. Fix: Use a batch file to launch the game

Update Properties: Right-click both BatmanAC.exe and BmLauncher.exe. Save as Launch_Arkham

• Fix: Use a batch file to launch the game.
• Create a new text document, paste:

  start /affinity 0FF "Batman Arkham City" BatmanAC.exe
  

• Save as Launch_Arkham.bat in the Win32 folder. Run the game via this batch file.
• Verification: This limits the game to the first 8 logical cores. QA testing in Jan 2026 confirms this stops the "Fatal Error: Thread Deadlock."

Have you encountered this error? Found another fix? Let us know in the comments below!

Go to the game's installation folder (e.g., Steam\steamapps\common\Batman Arkham City GOTY\Binaries\Win32). Right-click both BatmanAC.exe and BmLauncher.exe. Select Properties > Compatibility.