There's no issue with my music being in an unplayable format, the issue is with its being in a format that's unrecognizable by either the iTunes Store or the on-line database from which metadata is d/l'ed.
So, the only issue is the metadata? I am not sure if it is stilled called a store, but the fact a format is not recognized by Apple's Music Library, does not prevent you from entering a tune in your Music Library and sharing it with other devices or making a CD with that content. But you will have to enter the metadata manually.
