| sdn | Shareware Distributors Network |
| sea | StuffIt Expander Archive |
| sen | Scifer Internal Header Archive |
| sfds | Single File Data Storage |
| sfu | Omnifi DMP1 System Firmware Update |
| sfz | SFzip SoundFont Compressed Archive |
| shar | Unix Shell Archive |
| shk | ShrinkIt Archive |
| shr | Unix Shell Archive |
| sidf | NBackup SIDF Backup Archive |
| sis | Symbian Install Package |
| sisx | Symbian Series 3 Install Package |
| sit | StuffIt Expander Archive |
| sitd | StuffIt Expander Archive |
| sitx | StuffIt Expander Archive |
| sky | SKY Compressed Archive |
| skz | SuperKaramba Compressed Theme |
| sme | Samsung Kies Messages Backup |
| smea | Samsung Kies Messages Backup |
| snap | Snappy Package |
| snappy | Snappy Compressed Data |
| snz | Snappy SNZ Compressed File |
| sof | ReSOF Compressed Archive |
| sp1 | ShadowProtect Spanned Backup |
| sp2 | ShadowProtect Spanned Backup |
| sp3 | ShadowProtect Spanned Backup |
| sp4 | ShadowProtect Spanned Backup |
| sp5 | ShadowProtect Spanned Backup |
| sparc | Skype Plugin Archive |
| spb | Samsung Kies Contacts Backup |
