| spba | Samsung Kies Contacts Backup |
| spbm | Samsung Kies Contacts Backup |
| spf | ShadowProtect Full Backup |
| spi | ShadowProtect Incremental Backup |
| spk | SAS Model Package |
| spk | Synology Router Manager Package |
| spkg | SageMath Package |
| spkz | Scribe Template Package |
| spl | Splunk Application Package |
| split | 3DBrowser Splitted File |
| spm | Salt Package Manager Formula Package |
| sqx | SQX Compressed Archive |
| srep | SuperREP Compressed |
| srr | ReScene Data |
| ssa | Visual SourceSafe Backup Archive |
| ssb | Simply Safe Backup Archive |
| ssc | Samsung Kies Calendar Backup |
| ssp | FotoMagico Slideshow Package |
| ssp | SmartSync Pro Package |
| starpack | Starkit Package |
| stix | StuffIt Expander Archive |
| sue | SUE ARC Archive |
| sv4cpio | System V Release 4 CPIO Archive |
| sv4crc | System V Release 4 CPIO Checksum Data |
| swu | SWUpdate Archive |
| swup | AC70 Software Update Package |
| szp | SecureZIP Archive |
| szs | Nintendo Switch Game Archive |
| t4 | Top 4 Compressed Data |
| t7z | Littleutils To-7Zip Recompressed Archive |
