| 4dl | 4D Database Log |
| 4dr | 4D Database Data Resource |
| 4ds | 4D Database Data Segment |
| 4dug | 4D Database Users and Groups Data |
| 4dv | 4D View Ultrasound Data |
| 4dx | 4D Database Plug-in |
| 4fi | 4D Database ASCII Table Data |
| 4fr | 4D Database Apply Formula Data |
| 4lb | 4D Label Editor Data |
| 4lk | 4D Database Hotlink Data |
| 4log | 4D Database for Mac Log |
| 4mt | MacroToolbar Macro Set |
| 4pk | Perfect Keyboard Macro Set |
| 4qr | 4D Database Quick Report Document |
| 4sc | forScore Metadata |
| 4st | 4D Database Document SAVE SET Data |
| 4sw | 4DOS Swapfile |
| 4tw | Macro Toolworks Macro Set |
| 4ug | 4D Database Users and Groups Data |
| 4vr | 4D Database Saved Variable Data |
| 4ws | Macro Toolworks Data |
| 545 | Aimutation Skin |
| 5d | Microsoft Works Data |
| 5vw | Accellent 5View Packet Capture |
| 5xs | Line 6 POD HD500X Edit Setlist Data |
| 73b | TI-73 Backup |
| 73c | TI-73 Constant |
| 73d | TI-73 Calculator Graph Database |
| 73g | TI-73 Group Data |
| 73l | TI-73 Data List |
