I don't know the answer to that but the title of your thread threw me off a bit. Datamining is the process of running SQL queries against a data set (or sets) to extract specific results which can be used a number of ways. I mention it because a lot of people who might be able to help you may bypass this thread with the title being what it is.
The MPQ files are in hex, which leads me to believe they are encrypted, which means you would have to be able to decrypt them... which I'm not sure is possible? As Vegas said; I don't think people are datamining the way you are attempting with the MPQ files... This is all a guess though.