| #vc | ViewChoice Data |
| 113 | Iomega Backup Data |
| 12134 | Autodesk AutoCAD Tool Catalog |
| 1bk | 010 Editor Bookmark |
| 1pif | 1Password Interchange Format Data |
| 201 | StarMoney Agent Rollback Data |
| 2dm | SMS 2D Mesh Data |
| 2dp | GP Workbench 2DRadar Input Parameter File |
| 2dv | Cadwork Parametric Elements Data |
| 323 | H.323 IP Telephony Data |
| 32x | Sega 32X ROM Image |
| 356 | IPC-D-356 Data |
| 3cn | 3D Movie Maker Scene Data |
| 3dc | CompuTrainer 3D Chart Screen |
| 3dc | iGO 3D Building Data |
| 3dcpack | 3D-Coat Extension Package |
| 3de | 3Data Expert Data |
| 3dh | SeisWorks Horizontal Time-slice Format File |
| 3dmap | Catia 3DMAP File |
| 3dmap | Metaio SDK 3D Map |
| 3don | Scrutinize 3D Mesh Data |
| 3dr | 3DMark Results Data |
| 3drep | Catia 3D Geometry Data |
| 3dv | SeisWorks Vertical Time-slice Format File |
| 3dvs | 3DViewStation Document |
| 3dw | 3D World Studio Model |
| 3es | 3rd Eye Scene Data |
| 3fk | Bemio Froud-Krylof Data |
| 3gf | BlackVue Dashcam Accelerometer Data |
| 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 |