| seg3 | Stuffit Segment Data |
| segn | Stuffit Segment Data |
| sema | Secured EMail Archive |
| sen | Scifer Internal Header Archive |
| sfds | Single File Data Storage |
| sfu | Omnifi DMP1 System Firmware Update |
| sfz | SFzip SoundFont Compressed Archive |
| sgbzip | SaveGameBackup.net Archive |
| sha | Unix Shell Archive |
| shar | Unix Shell Archive |
| shk | ShrinkIt Archive |
| shr | Unix Shell Archive |
| sidf | NBackup SIDF Backup Archive |
| sis | Psion Series 3 Software Package |
| sis | Symbian Install Package |
| sisx | Symbian Series 3 Install Package |
| sit | StuffIt Expander Archive |
| sit5 | StuffIt 5 Archive |
| sitd | StuffIt Expander Archive |
| sitx | StuffIt Expander Archive |
| sky | SKY Compressed Archive |
| skz | SuperKaramba Compressed Theme |
| sle | Sisulizer Package |
| slp | Stampede Linux Package |
| sma | Silva Media Archive |
| sme | Samsung Kies Messages Backup |
| smea | Samsung Kies Calendar Backup |
| smea | Samsung Kies Messages Backup |
| smem | Samsung Smart Switch Message Data |
| smilebox | Smilebox Starter Archive |
| smsbackup | ASUS Messaging SMS Backup |
| sn3 | Samsung Kies 2 Backup Data |
| snap | Snappy Package |
| snappy | Snappy Compressed Data |
| snz | Snappy SNZ Compressed File |
