i have .gp3 files and i want to see it in home cd player, how i change it to .dat?

Answer 1

Home CD Player? If you are specifying a home VCD/DVD player, you can't. It's because the codec of the GP3 files are different to the file format used by both VCD and DVD players. Which means even if you burn those files directly to a CD/DVD, the players won't be able to read them.

There are programs that can convert 3GP files into MPEG1 (VCD) or MPEG2 (DVD) files. Such examples are :

TMPGEnc :
http://www.tmpgenc.net/en/e_main.html

Total Video Converter :
http://www.effectmatrix.com/total-video-converter

Answer 2

dont repost