iSkysoft products are common spammer material, so I have to wonder about GoDTuTs and his "How to Convert .wmv to .mp4 on Mac" video. Also, his "sort of hacked download" remark is a big red flag about the questionable nature of the particular version he provides (I sure wouldn't download it).
I'm sure your intention was good, Jay, but I'd rather we not promote iSkysoft or other iffy converter apps here so I removed your link...sorry.
This page is old and unfortunately hasn't been updated in years but I still find it a useful reference:
http://oncallnerd.com/blog-spam-hunt/
