I am posting this because I searched on steam/tripwireforums/reddit to solve this effing error.

[Side note: The game only works in x64 operating systems I think]

[IMPORTANT SIDE NOTE: Downloading .dll files might download you a virus! Be careful!]

This is what worked for me after trying so many things:

• 1st: Download DependencyWalker And extract it somewhere.

• 2nd: Open said program and Open the KF2 executable with it. ( Its in C:\Program Files (x86)\Steam\SteamApps\common\killingfloor2\Binaries\Win64 )

Now this program will tell you that there are " .dll " missing, these are the ones with a " ? " in a yellow circle. I had to do this 2 times first time I downloaded 9 .dlls the second time like 15. This will not fix it probably anyways but to make sure

• 3rd: Download the .dll that you need from here : [DLLFiles](www.dll-files.com) And unzip them in: killingfloor2\Binaries\Win64 . DOWNLOAD x64 VERSIONS IF POSSIBLE.

Once you have done this you will have to check everything with Dependency Walker. Now you will see that some DLLs are running in x86 instead of x64. THIS IS THE IMPORTANT PART FOR ME

• 4th: Download x64 versions of dx3dx9_43.dll ; x3daudio1_7 and xapofx1_5 . And any other dll that you need in that version. Remember to unzip them in killingfloor2\Binaries\Win64 .

This is what is not said in the tutorials, they tell you to download the missing ones but they dont tell you to replace the x86 ones :c

I Hope This "Tutorial" helps you. If you have any doubt feel free to tell me. Aaand if you find anything to fix in the post tell me too haha.