| .scw |
Movie Magic Screenwriter proprietary file |
| .sgm |
VisualBoyAdvance Saved Game |
| .ssa |
Sub Station Alpha Subtitle File |
| .sms |
Sega Master System ROM |
| .session |
CATIA 4 Session File |
| .scc |
SourceSafe Source Code Control File |
| .sla |
Scribus Document |
| .sla.gz |
Scribus Compressed Document |
| .story |
Storyist Document |
| .scriv |
Scrivener Document |
| .scrivx |
Scrivener XML Document |
| .sublime-project |
Sublime Text Project File |
| .sublime-workspace |
Sublime Text Workspace File |
| .stw |
StarOffice Document Template |
| .sdm |
StarOffice Mail Message |
| .sxg |
Apache OpenOffice Master Document |
| .sdoc |
Samsung Notes proprietary file |
| .skcard |
Starfish Sidekick Card File |
| .se |
Shuttle Document |
| .txt |
Plain Text File |
| .tex |
LaTeX Source Document |
| .tab |
Typinator Set File |
| .tmv |
TextMaker Template |
| .text |
Plain Text File |