Can't play HTM#N audio file

[Nigelcot]

Hi, I bought a non 3G 10.1 for my wife to use on her Open University course when travelling. We have a problem that none of the Audio files on the OU site will work, they appear to be modified HTML files. They work fine on PC. We have tried Flashplayer but that does'nt help. Have Googled but can't find a plugin to make this work, anybody had this problem and got a fix?
Thanks