Quote Originally Posted by worldofneil View Post
You definitely don't want to do that, they're two completely different files.

Your System32 directory has the 64-bit files and SysWOW64 is actually 32-bit files. I know that sounds round the wrong way, but basically both exist so when a 32-bit application runs (FFXIV in DX9 mode for example) then Windows transparently gives it the 32-bit files from SysWOW64 and when a 64-bit application runs (FFXIV in DX11 mode) then it uses the 64-bit files from system32.

You could just try running XIV in DX9/DX11 mode (the opposite of what you're doing now) although that's not a long term solution and you want to be running the DX11 version really.

So I'd suggest running Windows system file checker which, in theory, should find bad files (including the wmvcore.dll you just overwrote) and put working ones back. If it doesn't work it's only cost you a little time anyway.

To do this, on the start menu, find "Command Prompt" and right-click it and run-as administrator.

Then when you get the C:\Windows\system32> prompt come up type:

sfc /scannow

(note the direction of the /)

It might not work, but it's worth a try.
I had tried the sfc /scannow but it's unable to repair the files. Wish I could just find a safe way to download the .dll file but MS seems to make that as difficult as possible.