| dal | Download Accelerator Plus List |
| dam | DeltaMaster Analysis Model |
| dan | D-MAS Analysis Data |
| daq | Data Acquisition Toolbox File |
| das | DeltaMaster Analysis Session Data |
| dash | Dashlane Profile |
| dat | Treepad Database |
| dat | eM Client Database |
| dat | General Data File |
| dat | Affymetrix Image Data File |
| dat | Radiance Data File |
| dat | Nero BackItUp Drive Image |
| dat | DataFlex Database File |
| dat-shm | eM Client SHM Data |
| dat-wal | eM Client WAL Data |
| data | Analysis Studio Data |
| data | General Data File |
| database | Serato DJ Database |
| datd | Daily Aggregated Traffic Data |
| datr | DATR Data |
| datt | STK Processed Intermediate Terrain File |
| datx | Canon EOS Utility Data |
| dau | SPSS Overflow Data |
| da_ | Compressed DAT File |
| db | General Database File |
| db-shm | SQLite Database Shared Memory |
| db-wal | SQLite Database Write-Ahead Log |
| db1 | Tekla Structures Model |
| db2 | dBASE II Database |
| db2 | Tekla Numbering Database |
| db3 | Berkeley DB3 Database |
| db4 | dBASE IV Database |
| dba | Steinberg WaveLab Audio Database |
| dbb | Skype Binary Log File |
| dbc | DAZ Studio Brick Camera |
