I received a response from TescoDownload.com albeit a standard email. It seems I have to use Windows Media Player to transfer the downloaded files to my Rio Karma.
I suppose if I’d of thought about it I would have realised this as it must way they control the DRM on the files. I have now transferred [...]

I decided to email Tesco about the problem I had with the download from their music download store. I don’t want a refund just an explanation.
So far the only reply has been to tell me that they are having email problems and that a reply could take seven days!
Is 7 days acceptable for a reply [...]

and it confirmed why I have never done so before and will not do so again.
I’ve not paid for any music downloads until today. I read in Stuff magazine that Tescos (yes Tescos!) now have their own music download store; this seemed an amazing diversification for a supermarket chain but what really caught my [...]

Actually the device itself is almost full with just over 1Gb of free space.
For me the joy of a high capacity music player is that I can have my entire music collection with me at all times. So I don’t want to manage that collection; deciding what will and won’t be loaded onto the player [...]