I just tried to copy his tape to CD for a friend, first time for a while, and this W7 desktop copy of Media Player says it can't burn 'these files'. Wav files.
I digitised the tape with old faithful L.P.Recorder (WAV), dragged the files to Media Player and it refused to have anything to do with them. That's never happened before. I haven't tried to copy anything for a long while, but the last time I did, that's how I did it. Another burner refused too.
So, opinions if you please. Is the ancient L.P.Recorder the culprit, or an update in Windows. Or should I try to do the job with my irritating W10 business laptop?

All the cassette tapes and tape machines are dying, and my friend has lots of live recordings and is losing his sight and has never had a computer. And you thought I was a dinosaur!