jegster2014 posted a topic in ARMA 2 & OA - TROUBLESHOOTINGI have been having troubles with opening ArmA 2 Operation Arrowhead. I also have the following problem after continuing the problem I posted as the title above: Shaders Not Valid (mismatch of exe and data?) I am unsure of the issue, and unsure how to resolve it. I am willing to go to far extents to fix the issue. I have searched google, with no results. I tried installing Microsoft Redistructable, however did not manage to fix the issue. If anyone can help, thank you.