free programs to open any file extension
55 File Extensions starting with M
.M1V MPEG-1 Video
.M2TS MPEG-2 Transport Stream Videos
.M2V MPEG-2 Video
.M3U MP3 Uniform Resource Locator
.M4A MPEG-4 Audio File
.M4P Protected AAC File
.M4V MPEG-4 Video File
.M8 Heretic II MipMap Image
.MAC Mac Paint Image
.MACP Mac Paint Image
.MAG MAGIchan Graphics Image
.MANIFEST Windows Assembly Manifest File
.MAP DIV Game Studio Map Image
.MAP Fenix Map Image
.MBFAVS Stardent AVS X Image
.MBFS Stardent AVS X Image
.MBM Psion Serie 5 Bitmap Image
.MD5 MD5 Checksum File
.MDF MDF Disk Image
.MDI Microsoft Document Imaging Image
.MDL Half-Life Model Image
.MET OS/2 Metafile
.MGR MGR bitmap Image
.MID MIDI Audio Sequence
.MIF Image Magick file
.MIFF Image Magick file
.MIL Micro Illustrator Uncompressed Image
.MKA Matroska Audio Stream
.MKV Matroska Video Stream
.MNG Multiple Network Graphics Image
.MNL MathML Data
.MOD MOD Audio File
.MOV Apple QuickTime Movie
.MP TeX Metapost Macro
.MP1 MPEG-1 Audio Layer I
.MP2 MPEG-1 Audio Layer II
.MP3 MPEG-1 Audio Layer 3
.MP4 MPEG-4 Part 14 Multimedia Container
.MPEG1 MPEG-1 Video
.MPEG2 MPEG-2 Video
.MPEG4 MPEG-4 Video
.MPNT Mac Paint Image
.MRF Marks Russel File
.MRW Minolta Raw Image File
.MSK PaintShopPro Mask
.MSP Microsoft Paint Image
.MTS AVCHD Video File
.MTV MTV Ray-Tracer Image
.MTX Maw-Ware Textures Image
.MXF Material eXchange Format