| Abbreviation | Definition |
|---|---|
| SEA | Self- Extracting compressed Macintosh file Archive |
| SEC | Diskreet SECure Encrypted file |
| SEC | Disney Animation Studio Secured animation file |
| SEC | Pretty Good Privacy SECret key ring file |
| SEF | Smaps Exchange Format |
| SEP | Printer separator page |
| SEQ | Atari Animation file |
| SEQ | Bubble Chamber Sequential Instruction File |
| SES | Session info (Clarion Modula-2) |
| SET | Configuration Settings |
| SET | Driver SETs created by Install |
| SET | Setup data or information settings |
| SF | IRCAM Sound File |
| SF | OS/2 WPS attribute storage |
| SFB | HP Soft font |
| SFF | Scene File Format |
| SFI | HP LaserJet landscape Printer font |
| SFI | SIS Framegrabber Graphics |
| SFL | Ventura Publisher PCL 4 bitmap font - landscape |
| SFN | SPX Font |