| sui | StarSplatter User Interface |
| suite | Theme Manager Data |
| suj | Stacker Unlimited Job |
| sum | BSL Sum Data |
| sun | Mozilla Firefox Bookmark Backup Data |
| sup | ADS40 Socet Support Data |
| sup | Carlson 2016 Superelevation Data |
| sup | Corel WordPerfect Supplementary Dictionary |
| sup | HotMux Thermocouple Data Log |
| sup | Light-O-Rama SuperStar Editor Data |
| sup | SOCSIM Supervisory File |
| sup | Super Project Definition File |
| superedi | SuperEdi Data |
| supf | Egothor Similar Unit Pairs Data |
| suptree | IQ-TREE Bootstrap Supports Tree Data |
| sur | BSL Surface Plot Data |
| sur | Topocad Survey Data |
| surf | V_sim Surface Data |
| surfplace | Microsoft Money User Propfile Data |
| sus | SAP Transactionware GM POS Xpress Suspended Data |
| sus | Synergy Accounts Update Script |
| sut | ELITEpro Setup Tables Data |
| suu | Dell System Update Utility Archive |
| suv | SpriteUV2 Data |
| sv$ | Autodesk AutoCAD Automatic Save File |
| sv2 | SAS Stat Studio Metadata |
| sv2 | SAS View |
| sv2i | Symantec System Index |
| sv7 | SAS View |
| svag | eXtendable Wad Editor SVAG Data |
