Just when I thought extracting the roms from the more recent Sega Vintage Collections would be a piece of cake, it turns out that with the switch of emulator development teams, comes another poxy encrypted/compressed format which needs to be dissected. The emulator structure itself is pretty neat, with folders indicating what's what, including a "roms" folder. Problem is, every file is fed through the odd new format. The header reads "mxb" (hence the name). I've uploaded all the compressed rom files from the sets here (except for the T&J set), for those interested in examining it under their microscopes-o-fun.