| mb | Kodak EasyShare Thumbnail Cache |
| mb1 | Math Blaster 1 Data |
| UltraEdit Menus Data |
| mba | Martus Human Rights Bulletin System Data |
| MyBoard Activity Data |
| mbak | Quantrix Modeler Backup Data |
| mbb | CARAIBES Bathymetric Data |
| Kodak EasyShare MBB Data |
| mbbackup | Modelbench Backup Data |
| mbc | Mulberry E-mail Client Cache |
| mbd | RevolutionEDX Catalog |
| mbdata | Modelbench Scene Data |
| mbdb | iTunes Backup Manifest Database |
| mbdx | iTunes Backup Manifest Database |
| mbg | CARAIBES Georeferenced Depth Data |
| Microsoft Mail Mailbag |
| mbj | Yamaha EffectGear Data |
| mbk | dBASE IV Multiple Index Backup |
| QUANTA Brick Map Data |
| mbl | Multi-Batch Batch List |
| Vernier Logger Pro Data |
| mblanguage | Modelbench Language Data |
| mbn | Samsung Galaxy Multi Boot Image |
| Sony-Ericsson Phone Main Firmware |
| mbox | Unix Mailbox |
| mbp | Mobipocket Reader Data |
| Modbus Poll Data File |
| MyBackup Pro Database |
| mbs | Micrografx Picture Publisher Brush Shape |
| Opera Mail Mailbox |
| mbsa | Microsoft Baseline Security Analyser Report |
| mbsb | Mamut Enterprise Database Backup |
| mbsyncstate | mbsync Folder Backup |
| mbt | Blue Card Manager Merit Badge Template |
| ecBuilder Template |
| Metabot Metatag Options Data |
| mbtemplate | ModelBaker Custom Template Data |
| Modelbench Scene Template |
| mbu | Sony CAV-M1000ES Memory Backup |
| mbv | Everio MediaBrowser Edit Data |
| mbw | Easy Mail Backup Wizard Data |
| MBRWizard MBR Backup |
| mbx | Eudora Mailbox File |
| Microsoft Outlook Express v4 Mailbox |
| mc | MetaCard Stack Data |
| PSEmu Pro Memory Card Save |
| mc1 | MedCalc Data |
| mc3 | MC3D Document |
| mc4 | MicroCase v4 Data File |
| mc4d | Maxon Cinema 4D Object |
| mc5 | Poser 5 Material Collection |
| mc6 | Poser 6 Material Collection |
| mca | Apis Ceratina Data |
| mcacc | MCACC Measurement Data |
| mcapm | PocketMine-MP Minecraft Anvil Data |
| mcat | Adobe Photoshop Lightroom CC Catalog |
| Meerecat File Guard Encrypted Data |
| mcb | NEPLAN Root Network Data |
| mcc | Amiga MUI External Class Data |
| Mathcad Configuration Data |
| mcd | Bleem! Memory Card Save Data |
| MiniCAD Design Data |
| mcdata | MCData XML Data |
| mcdb | Media Cache Database |
| mcdoc | MadCap Contributor Project |
| mce | Sony CAV-M1000ES Common Source Infrared Command |
| mcf | MARS Component Data |
| MPRESS Control Format File |
| SignIQ Media Collection |
| TMPGEnc Conversion Template |
| mcfi | Autodesk Maya Initial Fluid Cache |
| mcfp | Autodesk Maya Fluid Cache Playback |
| mcfx | Palette 3 Pro Connected Mode Data |
| mch | Adobe Director Xtra Cache |
| mchelp | MadCap Flare DotNet Help Data |
| mcif | Macromolecular CIF File |
| mck | Macro Keys Encrypted Macro |
| mcl | MCell Cellular Automata Data |
| MUSHclient World Information |
| SmartCAM Macro File |
