Windows Essentials Codec Pack is a collection of video and audio codecs and tools that are required to encode and decode (that is, play) audio and video files. With this pack, according to the developer, you should be able to play 99% of all the movies and music files that you download off the Internet, and stay up to date with the latest codecs through the program's Codec Update Service.
Windows Essentials Codec Pack supports the following formats:
3GP, AAC, AC3, APE, AVI, DivX, 3ivx, DAT, h.264, x264, AVC, Nero Digital, DTS, FLV, FLAC, HD-MOV, MPEG-1, MPEG-2, M4A, MPC, MP3, MP4, MO3, MOD, MKV/MKA, MTM, OFR, TTA, OGG/OGM, S3M, Vorbis, VOB, WavPack, ATRAC3, XviD, XM, WV, UMX
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If you own a cell phone or other mobile device that supports 3GP video (the videos are in .3gp file format), you may be on the lookout for converter that can 
3GP is a simplified version of the 