Interesting - the "Best of PC" DVD is perhaps the original source of the mss32.dll fix?
If definitely isn't the same version .dll as the original 4 disc release many of us have
Also, please note, June 2010 DirectX Update
has just been released. Im not sure how this will affect existing installations, so just be aware that if you do install it, the only rollback is system restore to an earlier period or backup via thir party program like Acronis TrueImage