Well, I've finally uploaded the bugfix for the bug mentioned in the previous post. The program was crashing when the total size of all the files in the archive was too large for the data type I originally chose. I've changed it so it can handle larger sizes.
There is one more thing I'm aware of that needs to be changed (but in SFmpq) to fully support archives from World of Warcraft. I was notified by Quantam a while ago that there is a new compression method used and a new way of storing files in the archives. At the moment I can't remember the name of the compression method, but I know it started with a 'B' ;) Don't post to tell me which it is, I have all the info about this stuff somewhere. ;)