Windows media player will not play a 3gp file because it does not have the proper codec to play that file, and microsoft has not made a codec for their media player to play any 3gp files.
Realplayer SP will play your 3gp files and it is a free program. If you would like to try it out you can download it from Cnet here,
http://download.cnet.com/RealPlayer-SP/3000-13632_4-10073040.html
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