.XMV File Extension
File TypeXbox Media Video File
What is an XMV file?
Video file used by some games for the Xbox console system; uses a format developed by Microsoft specifically for playback on the Xbox; typically converted from a .WMV file to the XMV format using xmvtool, a program included with the Xbox software development kit provided by Microsoft.
An open source program called Microsoft XMV demuxer can be used to demux XMV files. This program is distributed as part of FFmpeg in the source code file xmv.c.