Not sure if this has been mentioned but the latest version of PFMAP-171-win works fine in W8.1 (64bit) for .mlv files. It doesn't/can't? successfully mount any .M00, M01 etc files.
All the files that I've tested with didn't have any embedded sound so I don't know if it works with an MLV with Audio file. Something to try another day and report the outcome.
All the files that I've tested with didn't have any embedded sound so I don't know if it works with an MLV with Audio file. Something to try another day and report the outcome.