Go to *media-convert.com/
It's an online file converter,completely free...
The video formats supported are 3GP AMV ASF AVI DV FLI FLV GVI MKV MOV MP4 MPG OGM RM SWF VOB WMV.
Movie conversion to AVI (DivX MPEG4), 3GP, SWF (Flash), AMV (for Chinese MP4/S1 MP3 players), MPEG2, MOV, MP4...