The .dta files are not in exactly the same format as Mafia or H&D2. Both these games use completely compressed .dta files, including the file directory (the data at the end of the .dta file which lists the files stored within it). WoW's files, however are either uncompressed or only partly compressed, and the file directory is certainly uncompressed. Therefore a standard Mafia file extractor won't work - but writing a new one should be fairly straightforward. Compressed/encrypted files are an absolute nightmare to write an extractor for, so if the creator managed to make a Mafia extractor, a WoW one shouldn't pose much of a challenge!
