Originally Posted by misterjuicy
Why does it say "unrecognized document format" when i try to open an mp3 file attached from an email?
Check you have OS 4.2 (OPtions-> About). Also you may be interested in MAsterDoc which allows playuing and saving MP3 and WAV attachments as files to your BB memory for further playing and sending as attachments. Here's a link to it http://dynoplex.com/blackberry/software/masterdoc.html