PSA: Killing Floor 2 not launching due to Avast flagging one .dll file as false positive

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Grizzled Veteran
Sep 20, 2015
After latest Avast update, it flags GFSDK_SSAO.win64.dll file as a malware. (confirmed with 2 other people that use Avast)
And since it puts the file into a virus chest, the game will not launch.

If you're avast user and you tried to launch the game today and it didn't launch, check the virus chest and find the file mentioned, in there you can choose an option of restoring it and adding that file to exception.


Active member
Jul 1, 2020
Avast caused a problem with one other game for me in the past, It was a free game but I don't remember which one was it