I haven't used SoundApp since OS8.5 but a good suggestion. I just realised I made a mistake in my 1st post, I think the QCD is windows only, a slip up.
Using such an early OS & probably an earlwer version of Java, a not uncommon problem is for Java (I suspect the culprit) to strip the files of their identity. If not that then it's of course not having an app that recognises that particular mp3/4 format.
I should have added it'd be best to drag & drop these blank files onto the app, be that soundapp, Audion, etc. But perhaps Audion requires os8.6 (it's called os9 version but it can be used in earlier os's - according to their website.) My favourite for 8.5 was SoundJam MP but that went out of production couple years ago. Their team went to work on the Apple iTunes team.