Peter, as Mark says, you need winzip or similar to get the audio files on a phone via google play store I expect - a proper Laptop computer - or tower, is the only way I would think of doing this. You might be able to do this at a local library perhaps?
But then I utterly hate mobile phones - the worse brain destruction & time wasting gadgets ever invented. Just look at the Robots walking around the street - nearly walking into other people or lamp posts as they let this gadget rule them. Their effect on children, is even more frightening to comprehend.
Sorry - my rant over.