| 3gt | 3D Graphic Tools Model |
| 3h | Advent 3B2 Tag Header |
| 3map | Thoughtograph Mind Map Data |
| 3mx | ContextCapture 3D Multiresolution Mesh eXchange Data |
| 3mxb | ContextCapture Binary 3MX Data |
| 3ox | 3Shape Order Exchange Format Data |
| 3oxz | 3Shape Order Exchange Format Data |
| 3pe | Intuit TurboTax 2008 Form |
| 3rf | Arbortext Advanced Print Publisher Cross Reference Data |
| 3sc | Bemio Scattering Data |
| 3sm | ContextCapture Scalable Mesh |
| 3th | 3D Movie Maker Thumbnail Data |
| 3ws | CityEngine Web Scene |
| 4a3 | STABCAL Data |
| 4b3 | STABCAL Data |
| 4br | 4D Backup Description Data |
| 4cm | ClickMouse Macro Set |
| 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 |
| 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 |