| rwd | RWD Archive |
| rwp | RapidWeaver Package |
| rz | Rzip Compressed Data |
| rzip | Remo ZIP Archive |
| s00 | ZipSplitter Splitted Archive |
| s01 | ZipSplitter Splitted Archive |
| s02 | ZipSplitter Splitted Archive |
| s03 | ZipSplitter Splitted Archive |
| s04 | ZipSplitter Splitted Archive |
| s05 | ZipSplitter Splitted Archive |
| s06 | ZipSplitter Splitted Archive |
| s07 | ZipSplitter Splitted Archive |
| s08 | ZipSplitter Splitted Archive |
| s09 | ZipSplitter Splitted Archive |
| s10 | ZipSplitter Splitted Archive |
| s7z | 7zX Compressed Archive |
| sa5 | SecretAgent 5 Encrypted Archive |
| saa | SecretAgent Auto-encrypted Archive |
| sar | Squeak Archive |
| sarc | Wii U SARC Archive |
| saz | Fiddler Session Archive Zip |
| sbb | Microsoft Accounting Backup |
| sbkp | Ultimate Backup for BlackBerry Archive |
| sbsar | Substance Designer Archive |
| sbu | Samsung Kies Backup Archive |
| scz | SmartDraw Collection Package |
| sdn | Shareware Distributors Network |
| sea | StuffIt Expander Archive |
| seg1 | Stuffit Segment Data |
| seg2 | Stuffit Segment Data |