Okay here is the first version of the MHX>MHGen utility.
http://www18.zippyshare.com/v/1orIqC0V/file.html (source included)
1. Get system file from MHX on your PC
2. Run cgen <path to system file> (drag and drop should work too)
3. Find MHGen output file in the "out" folder
4. Import these two files into MHGen
I'm out for dinner now, but I'll check back later. Pls report any issues, havent had a lot of time to check. Currently doesnt transfer DLC, seems more complicated than expected
For drag and drop, put file in the system file from MHX in the same folder as the exe. Excuse my poor ass coding