| .jcw |
JCross File |
| .jmt |
JMatch File |
| .jmx |
JMix File |
| .jms |
Masher Project |
| .key |
Software License Key File, Apple's Keynote software file, keyboard definition file |
| .khd |
Dynamics AX Kernel Help Data File |
| .khi |
Dynamics AX Kernel Help Index File |
| .kyr |
Lotus Domino Key Ring File |
| .kwm |
WebMoney Key File |
| .kmr |
KnowledgeMill Link File |
| .msi |
Windows Installer Package |
| .mdf |
SQL Server Database File |
| .mso |
Microsoft Office Macro Reference File |
| .mat |
MATLAB MAT-File |
| .mdl |
MathWorks Simulink Model |
| .map |
Quake Engine Map File |
| .md5 |
MD5 Checksum File |
| .mb |
Maya Binary Project File |
| .mwf |
MapGuide Author Map Window File |
| .mtd |
Musicnotes Digital Sheet Music File |
| .montage |
Montage Screenplay File |
| .mgt |
Musicnotes Guitar Guru Song File |
| .mif |
MapInfo Interchange Format File |
| .mdw |
Access Workgroup File |