| rwt | HyperRESEARCH Plugin |
| rwz | Microsoft Outlook Rules Wizard |
| rxc | Roxio Certificate |
| rxt | Retrospect Extension |
| s8l | SAP GUI Shortcut |
| safariextz | Apple Safari Extension Package |
| safe | SigzaLock Encrypted Data |
| save | Nano Temporary Save |
| sax | Spektrum DX8 Transmitter Firmware |
| sbf | Motorola System Firmware |
| sbh | IBM SQABasic Header |
| sbin | Cisco Router Unsigned Firmware Image |
| scap | MacBook EFI Firmware |
| scbo | MacBook EFI Unlock File |
| scexe | HP iL02 Firmware Update Data |
| scm | Gimp Script-Fu Script |
| search-ms | Windows Saved Search |
| sef | Encryptafile Signature |
| sek | Uniface License Key |
| service | Systemd Service Unit |
| session | Catia V4 Session |
| sext | Sogou Browser Extension |
| sf | Digital Signature |
| 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 |
| shs | Shell Scrap File |
| shy | ShyFile Encrypted File |
| sinf | iOS Application SC Info SINF File |
| ski | Motorola Phone Theme Skin |
| sko | Sage Accounting Executable |
