I'm guessing it's because of the size of the file. Usually large files tend to go corrupt because not everything is transferred properly. I found out why it is so large, and it's because I didn't compress the file at all. I uploaded a more manageable file to download. If there are problems after that it could be because of another mod you have installed.
http://www.filefront.com/14027417/BlackWolf.rar/
Also the hud mod would need to be approved by the FOTRS team because I used the texture as a base and then edited it.