| markdn | Markdown Document |
| markdown | Markdown Document |
| mas | WebFOCUS Master File Description |
| master | ASP.NET Master Page |
| mat | MATLAB Matrix |
| matlab | MATLAB Script |
| maz | Mazatrol Program |
| mb | MapBasic Source Code |
| mbac | MascotCapsule Resource Data |
| mbas | microBasic Source Code |
| mbo | MapBasic Compiled Object |
| mbrext | Mobirise Extension |
| mbx | MapBasic Program |
| mc | Sendmail M4 Configuration Source |
| mc | Windows Message Compiler Input |
| mcf | Microsoft Shell Console Script |
| mcl | microC Binary File |
| mcr | FactoryTalk View Studio Macro Component File |
| mcurl | Curl Manifest Data |
| mcw | MPLAB IDE Workspace |
| mdb | Crestron SIMPL Device Database |
| mdb | ProWorx NXT Memory Data with Blocking |
| mdes | Trimaran Machine Description Language Data |
| mdf | FactoryTalk View Studio Data Log Model |
| mdf | ProWorx NXT Memory Data File |
| mdl | 3D Gamestudio Model Data |
| mdl | Valve Source Model Data |
| mdle | Motion Description Language Extended Data |
| mdmp | Windows Debug Dump |
| mdown | Markdown Document |
| mdp | Microsoft Developer Studio Project |
| mdx | IBM Rational XDE Model Data |
| mdx | Multidimensional Expressions Script |
| mea | FactoryTalk View Studio Project Backup |
| mec | Hitachi Ladder Editor Memo Comment |
