| .sm |
SMath Studio Document |
| .s |
Source Code File |
| .sto |
PRO100 3D Interior Design Project |
| .step |
STEP 3D Model |
| .sh3d |
Sweet Home 3D Design File |
| .sh3f |
Sweet Home 3D Model Library |
| .skl |
Maya Skeleton File |
| .session |
CATIA 4 Session File |
| .sc4model |
SimCity 4 Model File |
| .smd |
Valve Studiomdl Data File |
| .stc |
Contribute Connection Key File |
| .si |
Softimage Image File |
| .sgn |
Signet Bureau DRM File |
| .s3g |
MakerBot 3D Print File |
| .sbsar |
Substance Archive |
| .tps |
Multi Channel Measurement File |
| .tcn |
Techne Model File |
| .t3d |
Unreal Engine 3D Object File |
| .tri |
FaceGen Polygonal Model File |
| .thl |
Total 3D Home Design File |
| .tvm |
TV3D Model |
| .thing |
MakerBot Thing File |
| .truck |
Rigs of Rods Truck Definition File |
| .tmd |
TextMaker Document |