MPEG-2 program streams also frequently use. mpeg extensions typically are MPEG-1 system streams that contain MPEG-1-encoded video and MPEG-1 Layer II (MP2)-encoded audio. However, MPEG-1 system streams do not exclusively use the. Let's see the detailed information about Windows Media Player supported MPEG file types:įiles that use. From this table, we note that MPEG files can be accepted by all versions of Windows Media Player.