DivxDecoder.dll missing?

Hello! I downloaded the WOTLK torrent and it worked just fine when I first started the .exe file. However, when I now try to start it, I get an error saying "DivxDecoder.dll is missing". This is the second time I have downloaded the torrent due to the same problem. Any thoughts on how I can fix this?

well, it is just a file of 404kb, you can open again that torrent but instead of downloading the whole Wotlk folder you can pick just that file