| .s2z |
Heroes of Newerth Game Data File |
| .smt |
Samsung Theme File |
| .sdz |
Spring Content Package |
| .sb2 |
Scratch 2.0 Project File |
| .sb3 |
Scratch 3.0 Project File |
| .s3z |
Compressed Scream Tracker 3 Module |
| .smz |
SMath Studio Compressed Document |
| .sment |
StarMade Entity File |
| .sfg |
Synfig Studio Compressed Project |
| .smsec |
StarMade Sector File |
| .smskin |
StarMade Skin File |
| .safenotebackup |
Safe Note Backup File |
| .sbm |
Space Engineers Mod File |
| .smod |
Stonehearth Mod File |
| .tbs |
TuneUp Utilities Boot Screen |
| .tsz |
Trillian Skin File |
| .tcx |
TestComplete Script Extension Package |
| .tbp |
Tekla BIMsight Project file |
| .thing |
MakerBot Thing File |
| .twzip |
theWord Compressed Archive Module |
| .twz |
theWord Compressed Archive Module |
| .utz |
UIQ Theme Package |
| .u3p |
U3 Smart Application |
| .ubox |
Universe Sandbox Data File |