File extension	The full name of the file	Popularity
File extension M	Objective-C Implementation File
File extension M12	Akregator file
File extension M15	MPEG Video
File extension M1A	MPEG-1 Audio File
File extension M1PG	iFinish Video Clip
File extension M1V	MPEG-1 Video File
File extension M2	World or Warcraft Model Object
File extension M21	MPEG-21 File
File extension M2A	MPEG-1 Layer 2 Audio File
File extension M2P	MPEG-2 Program Stream File
File extension M2S	MPEG-2 audio video file
File extension M2T	MPEG-2 transport stream file
File extension M2TS	Blu-ray BDAV Video File
File extension M2V	MPEG-2 Video
File extension M3	Blizzard MDX3 Model File
File extension M3D	DIALux 3D object file
File extension M3G	Mobile 3D Graphics Program
File extension M3U	Media Playlist File
File extension M3U8	UTF-8 M3U Playlist File
File extension M4	Macro Processor Library
File extension M4A	MPEG-4 Audio File
File extension M4B	MPEG-4 Audio Book File
File extension M4E	MPEG-4 Video File
File extension M4P	iTunes Music Store Audio File
File extension M4R	iPhone Ringtone File
File extension M4U	MPEG-4 Playlist
File extension M4V	iTunes Video File
File extension M75	MPEG Video
File extension MA	Maya Project File
File extension MA1	Monarch Audio File
File extension MAB	Mozilla Address Book
File extension MAC	MacPaint Image
File extension MACBIN	Macbinary Encoded File
File extension MAD	Access Module Shortcut
File extension MAE	Maestro molecular model file
File extension MAF	Microsoft Access form shortcut file
File extension MAFF	Mozilla Archive Format File
File extension MAG	Access Diagram Shortcut File
File extension MAGIK	Magik Source Code File
File extension MAHJONGTITANSSAVE-MS	Mahjong Titans Saved Game
File extension MAI	Microsoft Mail File
File extension MAILHOST	MSN Mailhost Settings File
File extension MAILPLANELICENSE	Mailplane License File
File extension MAILTOLOC	Mail Internet Location File
File extension MAK	Makefile
File extension MAKE	Xcode Makefile Script
File extension MAKEFILE	Makefile
File extension MAKO	Mako Template
File extension MAL	MadAppLauncher Configuration File
File extension MAM	Microsoft Access Macro
File extension MAN	Unix Manual
File extension MANI	Mine-imator Project File
File extension MANIFEST	Windows Application Manifest File
File extension MANM	Vietcong Game Data File
File extension MAP	Geographical map file
File extension MAPIMAIL	Send To Mail Recipient
File extension MAPLET	Maplet World File
File extension MAPSDATA	iOS Maps Data File
File extension MAPX	Mapjects Client Webparts File
File extension MAQ	Microsoft Access Query
File extension MAR	Mozilla Archive
File extension MARKDN	Markdown File
File extension MARKDOWN	Markdown Documentation File
File extension MARS	Adobe MARS File
File extension MARSHAL	Marshal Data Migration Model File
File extension MART	MartView eBook File
File extension MAS	Microsoft Access stored procedures file
File extension MASK	SpeedGrade Color Mask File
File extension MASSEFFECTPROFILE	Mass Effect Player Profile
File extension MASSEFFECTSAVE	Mass Effect Saved Game
File extension MASTER	ASP.NET Master Page
File extension MAT	Microsoft Access table shortcut file
File extension MATERIAL	Rigs of Rods Texture Reference File
File extension MATO	Atomic Combat Saved Game
File extension MAU	Media Attachment Unit
File extension MAV	Access View File
File extension MAW	Access Data Access Page
File extension MAX	3ds Max Scene File
File extension MAXC	3ds Max Container File
File extension MAZ	Hover! Maze File
File extension MB	Maya Binary Project File
File extension MBB	Kodak EasyShare Data File
File extension MBBK	ManaBook Book Kit File
File extension MBD	Multimedia Builder Project File
File extension MBF	Microsoft Money Backup File
File extension MBG	Mailbag Assistant Mailbox File
File extension MBI	Multi-Bootable Information File
File extension MBK	dBASE IV Multiple Index Backup File
File extension MBL	Logger Pro Data File
File extension MBM	Multi Bitmap File
File extension MBOX	E-mail Mailbox File
File extension MBP	Mobipocket Notes File
File extension MBR	Zune Smooth Streaming File
File extension MBS	Opera Mailbox File
File extension MBSA	Microsoft Baseline Security Analyzer File
File extension MBT	Blue Card Manager Merit Badge Template File
File extension MBW	MBRWizard Archive
File extension MBX	Outlook Express Mailbox
File extension MC1	MedCalc Data File
File extension MC2	MasterCook 5 Cookbook File
File extension MC5	Poser 5 Material File
File extension MC6	Poser Material Collection File
File extension MC9	Mastercam 9 Geometry File
File extension MCA	Minecraft "Anvil" Map File
File extension MCD	VectorWorks drawing file
File extension MCDX	Mathcad Prime Document
File extension MCF	Mathcad font file
File extension MCFI	Maya Initial Fluid Cache File
File extension MCFP	Maya Fluid Cache Playback File
File extension MCGAME	Minecraft Game Backup File
File extension MCI	Media Control Interface File
File extension MCL	Windows Media Center Link File
File extension MCLEVEL	Minecraft Map File
File extension MCMETA	Minecraft Animation File
File extension MCO	Live Messenger Winks File
File extension MCP	MSN Content Plus installer file archive
File extension MCR	3ds Max Macroscript File
File extension MCRP	MobyExplorer Encrypted File
File extension MCS	Mathcad Image
File extension MCSP	My Craft Studio Project File
File extension MCSX	My Craft Studio Professional File
File extension MCW	Microsoft Word 5 for Mac document file
File extension MCWORLD	Minecraft World Backup File
File extension MCX	MICRO CADAM-X/6000 Model Data File
File extension MCXE	MedicinesComplete Data File
File extension MCZ	Compressed Poser Material File
File extension MD	Markdown Documentation File
File extension MD0	Alcohol Disk Image Segment 1
File extension MD1	GEAR CD/DVD Disc Image
File extension MD2	Quake 2 Player Model
File extension MD3	Quake 3 3D Model
File extension MD5	MD5 Checksum File
File extension MD5TXT	Message Digest 5 Hash File
File extension MD5ANIM	id Tech 4 Model Animation File
File extension MD5CAMERA	id Tech 4 Model Camera File
File extension MD5MESH	id Tech 4 3D Mesh File
File extension MD8	Mediator Project File
File extension MDA	Access Add-in
File extension MDB	Microsoft Access Database
File extension MDBACKUP	iPhone Data Backup File
File extension MDBHTML	Microsoft Access Database HTML File
File extension MDC	Image Minolta RD175
File extension MDD	Point Oven Deformation Data File
File extension MDDATA	iPhone Backup File
File extension MDE	Compiled Access Add-in File
File extension MDF	Media Disc Image File
File extension MDI	Microsoft Document Imaging File
File extension MDINFO	iPhone Backup Information File
File extension MDL	Flight Simulator 95/98 3D model file
File extension MDM	HLM Multivariate Data Matrix File
File extension MDMP	Windows Minidump
File extension MDN	Blank Access Database Template
File extension MDOWN	Markdown File
File extension MDP	Visual C++ 5 Workspace File
File extension MDS	Media Descriptor File
File extension MDT	GeoMedia Access Database Template
File extension MDW	Access Workgroup File
File extension MDX	Extended Media Descriptor File
File extension MDZ	Access Wizard Template
File extension MDZIP	MagicDraw Project Archive
File extension ME	Readme Text File
File extension ME2MOD	Mass Effect 2 Modification File
File extension MEB	PRO100 3D Interior Catalog Element
File extension MED	Amiga MED Sound File
File extension MEF	Mamiya RAW Image
File extension MEG	MEGA Data File
File extension MEGA	Megacubo XML Metafile
File extension MEL	Maya Embedded Language File
File extension MELL	Mellel Word Processing File
File extension MELLEL	Mellel Word Processing Document
File extension MEM	FoxPro Variable File
File extension MENC	Windows Mobile Encrypted File
File extension MENU	Quake 3 Engine Menu File
File extension MEO	MEO Encrypted Archive
File extension MER	Corel WordPerfect Macro Editor resident area file
File extension MERLIN2	Merlin Project File
File extension MERLINLICENSE	Merlin License File
File extension MESH	DirectX Mesh File
File extension MET	eMule Resource File
File extension META	RealPlayer Metafile
File extension METADATA_NEVER_INDEX	Spotlight Never Index File
File extension MEX	Macro Express File
File extension MF	Java Manifest File
File extension MFA	Multimedia Fusion Development File
File extension MFCRIBBON-MS	MFC Ribbon Definition XML File
File extension MFE	character studio file
File extension MFIL	Blizzard Software Update File
File extension MFL	Mozilla FastLoad File
File extension MFO	Perl ModInfo Descriptor File
File extension MFP	MediaFACE Project File
File extension MFS	MetFS Encrypted File System
File extension MFT	MediaFACE Project Template
File extension MFU	Backdoor.Win32.Agent.mfu virus file
File extension MFV	MobileFrame Device Pack File
File extension MFW	MobileFrame Workflow Pack File
File extension MFX	Multimedia Fusion Extension
File extension MGA	Manga Document
File extension MGC	Microsoft Clip Organizer Media Catalog
File extension MGCB	Equation Illustrator Project File
File extension MGDATABASE	MacGourmet Deluxe Database File
File extension MGF	Materials and Geometry Format
File extension MGK	ImageMagick Configuration File
File extension MGL	Age of Empires 2 Replay File
File extension MGM	MGCSoft Equation Editor Macro file format
File extension MGMF	MindGenius Map File
File extension MGMT	MindGenius 2-3 Template
File extension MGMX	MindGenius XML Map File
File extension MGO	MacGourmet Recipe File
File extension MGOURMET	MacGourmet Deluxe Document
File extension MGOURMET3	MacGourmet Deluxe 3 Document
File extension MGS	MGCSoft Vector Shapes File
File extension MGT	ZX Spectrum emulator disk image
File extension MGTHEME	MacGourmet Theme File
File extension MGTX	MindGenius XML Template File
File extension MGV	PSP Video File
File extension MGX	Micrografx Designer drawing file
File extension MHS	Xilinx XPS Hardware Specification File
File extension MHT	MHTML Web Archive
File extension MHTML	MIME HTML File
File extension MI4	Audio Player Firmware File
File extension MIC	Image Composer File
File extension MID	MIDI File
File extension MIDI	MIDI File
File extension MIF	MapInfo Interchange Format File
File extension MIG	Windows Migration Backup File
File extension MII	Wii Virtual Avatar File
File extension MILK	MilkDrop Winamp Plugin Preset
File extension MIM	Multi-Purpose Internet Mail Message File
File extension MIME	Multi-Purpose Internet Mail Extension
File extension MIN	Okuma CNC Program File
File extension MINDNODE	MindNode Document
File extension MINE	Minecraft Map File
File extension MINESWEEPERSAVE-MS	Minesweeper Saved Game
File extension MINI2SF	Nintendo DS Sound Information File
File extension MININCSF	NCSF Nintendo DS Audio File
File extension MINIPSF	Miniature PlayStation Sound Format File
File extension MINIPSF2	Miniature PlayStation Sound Format File
File extension MINIUSF	Nintendo 64 Song File
File extension MINT	Linux Mint Installer File
File extension MIO	MioEngine Application File
File extension MIP	Multiple Image Print File
File extension MIR	Mini-Image Ripper Disc Image
File extension MIS	Saved Game Mission File
File extension MISSION	MissionMaker Project File
File extension MIT	MineEdit Inventory Template File
File extension MIX	Microsoft Image Exchange File
File extension MJ2	Motion JPEG 2000 Video Clip
File extension MJD	Adobe Acrobat MIME Encoded Job Definition File
File extension MJDOC	MacJournal Document
File extension MJP	MJPEG Video File
File extension MJPG	Motion JPEG Video File
File extension MK	Makefile
File extension MK3D	Matroska 3D Video File
File extension MK4	Schiller medilog ECG Raw Data File
File extension MKA	Matroska Audio File
File extension MKV	Matroska Video File
File extension ML	ML Source Code File
File extension MLB	MyLabel Designer Deluxe Project File
File extension MLC	Microsoft Language Interface Pack
File extension MLK	MasterCook Look File
File extension MLL	Maya Plugin
File extension MLP	Meridian Lossless Packing Audio File
File extension MLS	Miles Sound Tools compressed DLS file
File extension MM	Objective-C++ Source File
File extension MM6	Might and Magic 6 saved game file
File extension MM7	Might and Magic 7 saved game file
File extension MM8	MusicMaker V8 audio file
File extension MMA	Master Album Maker Photo Album File
File extension MMAP	MindManager Map File
File extension MMAT	MindManager Map Template
File extension MMC	Microsoft Media Catalog
File extension MMCOLLECTION	Microsoft Outlook Mail Manager plug-in collection file
File extension MMDC	MediaMonkey Device Configuration File
File extension MME	Multi-Purpose Internet Mail
File extension MMF	Microsoft Mail message file
File extension MMIP	MediaMonkey Installation Package
File extension MML	FrameMaker Maker Markup Language File
File extension MMM	MultiMedia Movie format (RIFF RMMP)
File extension MMO	RapidFile memo document file
File extension MMP	MixMeister Studio playlist file
File extension MMU	myPM Merge Data File
File extension MMV	MicroMV Video File
File extension MMW	AceMoney Money File
File extension MNC	AutoCAD compiled menu file
File extension MNG	Multiple Network Graphic
File extension MNH	Master Navigator Header File
File extension MNK	My Notes Keeper Notebook
File extension MNL	AutoCAD Menu LISP File
File extension MNM	Character Studio Marker Name File
File extension MNO	Macromedia Design Note
File extension MNR	AutoCAD Menu Resource File
File extension MNS	AutoCAD Interface Settings File
File extension MNT	FoxPro Menu Memo
File extension MNU	AutoCAD Interface Layout File
File extension MNV	PlayStation Movie File
File extension MNX	FoxPro Menu
File extension MNY	Microsoft Money File
File extension MO	Machine Object File
File extension MO3	MO3 Audio File
File extension MOB	MOBTV Video File
File extension MOBI	Mobipocket eBook
File extension MOBILECONFIG	Apple Mobile Configuration File
File extension MOBILEPROVISION	iOS mobile device provisioning profile file
File extension MOD	Amiga Music Module File
File extension MODD	Sony Video Analysis File
File extension MODE	Coda Syntax Mode File
File extension MODEL	CATIA 3D Model FIle
File extension MODULE	Drupal Module File
File extension MOF	Managed Object Format File
File extension MOFF	Sony Video Analysis Index File
File extension MOGG	Multitrack Ogg File
File extension MOHO	Anime Studio Animation Project
File extension MOI	JVC Everio digital audio file
File extension MOL	MDL Molfile
File extension MOM	Managed Object Model
File extension MOMMA	Offspring Fling Replay File
File extension MONEY	Money Data File
File extension MONEYWELL	MoneyWell Account File
File extension MONTAGE	Montage Screenplay File
File extension MOOV	Apple QuickTime Movie
File extension MOS	Leaf Camera RAW File
File extension MOSAIC	MacOSaiX Mosaic File
File extension MOT	LightWave Motion File
File extension MOU	WinMount Compressed File
File extension MOV	Apple QuickTime Movie
File extension MOVIE	QuickTime Movie File
File extension MOX	ExtendSim Simulation Software Model
File extension MOZ	Mozilla Cache File
File extension MP	Maya PLE Project File
File extension MP1	MPEG-1 Layer 1 Audio File
File extension MP10	Multisim 10 Project File
File extension MP11	Multisim 11 Project File
File extension MP2	MPEG Layer II Compressed Audio File
File extension MP21	MPEG-21 Multimedia File
File extension MP2M	Max Payne 2 Mod File
File extension MP2S	Max Payne 2 Saved Game
File extension MP2V	MPEG-2 Video File
File extension MP3	MP3 Audio File
File extension MP4	MPEG-4 Video File
File extension MP4INFOVID	Parrot AR Drone and Gyro Flyer Video
File extension MP4V	MPEG-4 Video
File extension MP7	Multisim 7 Project File
File extension MP9	Multisim 9 Project File
File extension MPA	MPEG-2 Audio File
File extension MPB	MyPhoneExplorer Backup File
File extension MPC	Musepack Compressed Audio File
File extension MPCPL	Media Player Classic Playlist
File extension MPD	Microsoft Project Database
File extension MPDCONF	Music Player Daemon File
File extension MPDP	MixPad Project File
File extension MPE	MPEG Movie File
File extension MPEG	MPEG Movie
File extension MPEG1	MPEG-1 Video File
File extension MPEG4	MPEG-4 File
File extension MPF	Microsoft Media Package FIle
File extension MPG	MPEG Video File
File extension MPG2	MPEG-2 Video File
File extension MPGA	MPEG-1 Layer 3 Audio File
File extension MPGINDEX	Adobe MPEG Index File
File extension MPI	InstallJammer Project File
File extension MPJ	RoboHelp HTML Project
File extension MPK	Painkiller Overdose game map file
File extension MPKG	Meta Package File
File extension MPL	AVCHD Playlist File
File extension MPLS	Blu-ray Movie Playlist File
File extension MPM	Corel WordPerfect MathPlan Macro file
File extension MPO	Multi Picture Object File
File extension MPP	Microsoft Project File
File extension MPPZ	MagicPlot Project File
File extension MPR	FoxPro Generated Menu Program
File extension MPS	Pocket Streets Map File
File extension MPSUB	MPlayer Subtitles File
File extension MPT	Microsoft Project Template
File extension MPU	MPEG Layer 3 Audio File
File extension MPV	MPEG Elementary Stream Video File
File extension MPV2	MPEG-2 Video Stream
File extension MPW	Microsoft Project Workspace File
File extension MPX	Microsoft Project Exchange File
File extension MPZ	Miradi Project File
File extension MPZIP	Multisim Pack File
File extension MP_	Mobile Phone Sound File
File extension MQ4	MetaTrader Custom Indicator
File extension MQO	Metasequoia Document
File extension MQV	Sony Movie Format File
File extension MRB	Multiple Resolution Bitmap File
File extension MRC	mIRC Script File
File extension MRG	MySQL Merge File
File extension MRIMG	Macrium Reflect Disk Image
File extension MRK	DPOF Auto Print Order File
File extension MRML	3D Slicer Scene Description File
File extension MRS	Corel WordPerfect Macro resource file
File extension MRT	Microsoft Visio 2010 installation archive file
File extension MRW	Minolta Raw Image File
File extension MRXS	MIRAX Virtual Slide File
File extension MS	3ds Max Script File
File extension MS-TNEF	MS Transport Neutral Encapsulation Format
File extension MS1	VirtualBus Map File
File extension MS10	Multisim 10 Circuit Design File
File extension MS11	Multisim 11 Circuit Design File
File extension MS3D	MilkShape 3D Model
File extension MS7	Multisim 7 Circuit Design File
File extension MS8	Multisim 8 Circuit Design File
File extension MS9	Multisim 9 Circuit Design File
File extension MSB	The Bat! file
File extension MSC	Microsoft Management Console Snap-in Control File
File extension MSCX	MuseScore Music Score File
File extension MSCZ	MuseScore Compressed Score File
File extension MSD	Map Service Definition File
File extension MSDVD	Windows DVD Maker Project File
File extension MSE	3ds Max Encrypted MAXScript File
File extension MSF	Mail Summary File
File extension MSG	Outlook Mail Message
File extension MSH	Orbiter 3D Mesh File
File extension MSHA	Microsoft Help Asset File
File extension MSHC	Microsoft Help Container File
File extension MSHI	Microsoft Help Index File
File extension MSI	Windows Installer Package
File extension MSIF	MyLabel Designer Deluxe Data File
File extension MSK	Paint Shop Pro Mask File
File extension MSKN	MediaMonkey Skin File
File extension MSL	Miranda IM smiley definitions
File extension MSM	Windows Installer Merge Module
File extension MSN	Host Blocking File
File extension MSO	Inline E-mail Attachment
File extension MSP	Windows Installer Patch
File extension MSPX	Microsoft ASP.NET Web Page
File extension MSRCINCIDENT	Windows Remote Assistance Invitation File
File extension MSS	Miles Sound System DLS 1 sound format
File extension MSSTYLE	Windows XP Unsigned Style
File extension MSSTYLES	Windows XP Style
File extension MST	Windows Installer Setup Transform File
File extension MSU	Windows Vista Update Package
File extension MSV	Memory Stick Voice File
File extension MSW	Microsoft Word 5 Document file
File extension MSWMM	Windows Movie Maker Project
File extension MT2	MadTracker 2 Module
File extension MT9	MT9 Audio File
File extension MTA	Samsung AllShare Metadata File
File extension MTD	Musicnotes Digital Sheet Music File
File extension MTE	MadTracker 2 Envelope
File extension MTF	Motorola Theme File
File extension MTH	Derive Math File
File extension MTI	MadTracker Instrument
File extension MTL	OBJ Material File
File extension MTM	MultiTracker Module
File extension MTP	MadTracker 2 Pattern
File extension MTS	AVCHD Video File
File extension MTT	Microsoft Messenger saved contact file format
File extension MTV	MTV Video Format File
File extension MTW	Minitab Worksheet File
File extension MTX	Microsoft Visual Studio manual test text file
File extension MTZ	MIUI Theme
File extension MU	Corel Quattro Pro for DOS menu definition file
File extension MU3	Myriad Packed Musical Score
File extension MUD	Textease multi user database
File extension MUF	Alpha Five Licence File
File extension MUI	Multilingual User Interface File
File extension MUI_CCCD5AE0	Hid User Library
File extension MUL	Ultima Online Multi File
File extension MUM	Windows Vista Update Package
File extension MUP	Music Publisher Score
File extension MUS	Finale Notation File Format
File extension MUSA	Aleph One Music File
File extension MUSE	Adobe Muse Website Project
File extension MUX	Trackmania Music File
File extension MUZ	MUZ Audio File
File extension MV	IRIX command compressed movie file
File extension MVB	Multimedia Viewer Book Source File
File extension MVC	MivaScript Compiled File
File extension MVD	Movie Edit Pro Movie File
File extension MVE	Infinity Engine Movie File
File extension MVEX	Muvee autoProducer 6 Project File
File extension MVI	AutoCAD Movie Command File
File extension MVP	Movie Edit Pro Video Project File
File extension MVR	IBM HotMedia Multimedia File
File extension MVS	MusicMatch Jukebox visualization file
File extension MVX	Multimedia Fusion Movement Extension
File extension MVY	Video easy Project File
File extension MV_	Movie Edit Pro Movie Backup File
File extension MW	Maple Worksheet
File extension MWAND	GarageBand MagicMentor Template
File extension MWB	MySQL Workbench Document
File extension MWD	MarinerWrite Document
File extension MWF	MapGuide Author Map Window File
File extension MWLIC	MoneyWell License File
File extension MWP	Lotus Word Pro SmartMaster File
File extension MWS	Maple Classic Worksheet
File extension MWX	MapGuide Author Map Window XML File
File extension MX	Mathematica Serialized Package File
File extension MX3	Mixcraft 3 Audio Project
File extension MX4	Mixcraft 4 Audio Project
File extension MX5	Mixcraft 5 Audio Project
File extension MX5TEMPLATE	Mixcraft 5 Audio Project Template
File extension MXAD	Mandelbrot Explorer All Data File
File extension MXADDON	Maxthon Add-On File
File extension MXC2	MAGIX Cache File
File extension MXCS	Mandelbrot Explorer Color Scheme File
File extension MXD	ArcGIS Map Document
File extension MXDIC	Maxthon Dictionary File
File extension MXE	Corel Quattro Pro startup macro file
File extension MXF	Material Exchange Format File
File extension MXFR	Mandelbrot Explorer Fractal Region File
File extension MXG	Miinoto Exchangeable Group File
File extension MXI	Adobe Dreamweaver Extension Manager file
File extension MXL	Compressed MusicXML File
File extension MXM	MixMeister BPM calculation file
File extension MXMF	Mobile XMF Ringtone File
File extension MXML	Flex MXML Component
File extension MXN	Miinoto Exchangeable Note File
File extension MXP	Adobe Extension Package
File extension MXS	Maxwell Studio Scene File
File extension MXSKIN	Maxthon Skin File
File extension MXT	ArcGIS Map Template
File extension MXV	MAGIX Video File
File extension MYAPP	Visual Studio Application XML File
File extension MYCOLORS	Stardock MyColors Theme File
File extension MYD	MySQL Database Data File
File extension MYDOCS	Send To My Documents
File extension MYI	MySQL MyISAM Index File
File extension MYL	MyLogo Maker Image
File extension MYR	Myriad Music File
File extension MYS	Vineyard Captured Video File
File extension MZP	MAXScript Zip Package
File extension MZZ	Microsoft .NET Download Package