I have a large library of DVD ISO images most of which play OK in Mezzmo, but there are a few that are not recognized as a video format by Mezzmo. These few play OK outside of Mezzmo, but for some reason the .iso file just shows as a folder in Mezzmo with no content i.e. no VOB content. I think the common thread is that these few do not have a menu, but otherwise I cannot see what the difference might be. Your assistance please.