| sf | Digital Signature |
| OS/2 Warp Workplace Shell Attribute Storage |
| sfe | Logomatic v2 Firmware |
| sfv | Simple File Verification Checksum |
| sgz | SigzaLock Encrypted Data |
| sh3p | Sweet Home 3D Plugin |
| sha224 | SHA224 Hash Data |
| sha256 | SHA256 Hash Data |
| sha384 | SHA384 Hash Data |
| shlb | Mac OS X Shared Library Data |
| shs | Shell Scrap File |
| shy | ShyFile Encrypted File |
| signed | Mac OS X Signed File |
| sinf | iOS Application SC Info SINF File |
| ski | Motorola Phone Theme Skin |
| sko | Sage Accounting Executable |
| sks | Shareaza Skin |
| skype | Skype Content File |
| slf | Symantec License File |
| slife | Slife Database |
| slupkg-ms | XrML Digital License Package |
| smrd | Adobe InDesign Import Filter |
| smwt | Adobe InDesign Export Filter |
| snt | Windows Sticky Notes |
| sock | Linux Socket File |
| spa | Spotify App |
| spln | APID ToolAssistant Scripted Plugin |
| spmtx | Spektrum DX9 Transmitter Firmware |
| sr0 | SecuROM Analysis Data |
| ss4 | SigScribe4 Design Document |
| ssk | SmartSoftKey AMPLock Encrypted File |
| st3plugin | SportTracks 3 Plugin |
| st5 | shntool MD5 Checksum |
| startgadget | Start++ Gadget |
| startlet | Start++ Script |
| stc | Adobe Acrobat Exchange Plug-in |
| std | Adobe Acrobat Exchange Plug-in |
| ste | Dreamweaver Site Definition |
| stp | Adobe Acrobat Exchange Plug-in |
| sublime-workspace | Sublime Text Workspace |
| sugar | Espresso Plug-in |
| supp | iOS Application SC Info SUPP File |
| svp | Sonique Visualization Plugin |
| sw2 | Softwrap License |
| swdf | Voopoo Drag 2 Firmware Update |
| switch | Switch Package |
| sxs | SAS Stat Studio Module |
| sxscr | SIMetrix Script |
| sxz | Snarl Extension |
| syc | SYSTAT Command |
| sys | General System File |
| MS-DOS System File |
| t2l | True2Life Scene |
| t3x | TYPO3 Extension File |
| task | HP Printer Utility Task Plugin |
| tasl | NASL Pedant TASL Script |
| tbp | Aston Toolbar Plug-in |
| The Bat! Plugin |
| tbs | TuneUp Utilities Boot Screen |
| tco2 | TI-Nspire CX II OS Image |
| td | Thunder Incomplete Download |
| td5 | Panasonic KTS Application |
| tdz | Drobo Firmware File |
| teb | TEAC Firmware Update Data |
| temp | General Temporary File |
| tfu | Torpedo Live Firmware Update |
| tgk | Terragen License Key |
| tgp | Terragen Plugin |
| thn | AMC Graphic Workshop Thumbnail |
| thumbnails | Android Thumbnails Folder |
| tiapp | TiTanium App |
| tip | TuneUp Utilities Icon Package |
| tis | Acronis True Image Script |
| tko | AMX Software Module |
| tls | TuneUp Utilities Logon Screen |
| tmb | Timbuktu Pro Connection Data |
| tmp | General Temporary File |
| tms | Telemate Script |
| tnc | TI-Nspire CAS OS Image |
| tno | TI-Nspire OS Image |
