| 4d | 4DIM Model Data |
| 4db | 4D Database Structure Data |
| 4dc | 4D Database Compiled Structure |
| 4dd | 4D Database Data File |
| 4det | 4D Database for Mac Label Editor Data |
| 4df | 4D Database Search Document |
| 4dg | 4th Down Football Scout Game Data |
| 4dhl | 4D Database for Mac Hotlink Data |
| 4dl | 4D Database Log |
| 4dm | 4D Database Method Data |
| 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 |
| 4mp | 4-MP3 Database |
| 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 ToolsWorks Backup Data |
| 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 |
| 5br | Fivebar Geometry Data |
| 5d | Microsoft Works Data |
