| md5sum | MD5 Checksum |
| md5sums | MD5 Checksum |
| md93 | Macromedia Director 4 Data |
| md95 | Adobe Director for Mac Data |
| mdat | REW Measurement Data |
| mdb | Nastran Modal Database |
| mdb | RockWorks Borehole Database |
| mdbx | Microsoft Access JET Database |
| mdc | Cognos Cube File |
| mdccache | Microsoft Document Connection Cache Data |
| mdcs | MATLAB Distributed Computing Server Saved Session |
| mdd | MDict Resource Data |
| mdd | Notation Composer Midi Device Description |
| mdd | Quanquest SPSS Questionnaire Definition Data |
| mdd | Xilinx Microprocessor Driver Description |
| mdef | ANSYS Workbench Managed Data |
| mdex | Mifos Data Exchange XML Data |
| mdf | I-DEAS Master Drafting Machine Data |
| mdf | Insight II Molecular Data |
| mdf | Microsoft SQL Server Database |
| mdg | myPM Merge Data |
| mdif | EEsof Model MDIF File |
| mdinfo | iPhone Backup Information Data |
| mdist | PLINK Genomic Distance Proportion Matrix Data |
| mdl | Animation Master Model Data |
| mdl | Bentley MicroStation MDL Program |
| mdl | Cognos Exported Model Data |
| mdl | IBM Rational Rose Model Data |
| mdl | Leadwerks 3D Model |
| mdl | MDL Molfile Data |
