"David" wrote ...
> My MP3 player can record voice, but only in a file extention
> of .rec. Real Player and Windows Media player dont reconize
> this format, what software should I use to play a .rec file?

It would be far more likely that someone could help you if you
provided the context of the make/model of your MP3 player.
Many of these kinds of things use proprietary or semi-obscure
formats, but can translate to wav, mp3, etc upon upload (etc.)