Hmm... I've been in and out of the Hive for a while, and was looking through old visitor messages and stumbled upon one where you were asking about the import menu failing entirely for the Matrix Eater. It looks like I passed over your message and never stopped by to help get it resolved!
Did you ever solve that issue? I've had some computer failure recently, and the Matrix Eater does not work on my new machine setup. It's not entirely clear to me why -- it says that the JStormLib.dll library it is using for opening up MPQ files requires some Windows-specific dependencies that my new computer (With a dying install of Windows 10) apparently lacks.
I've started researching alternate methods, such as a pure-java MPQ reader so that if Java works the Matrix Eater will be more likely to just work. But, I have a ways to go before I finish learning enough about MPQs to make a pure-java MPQ library -- and I haven't found any online. (There was one written to parse SC2 replay files, but apparently it was unable to process the encryption used in WC3 MPQ files.)