.saf - Standard Archive Format.

.scr - Screensaver file. These files can be found in your operating system directory and contain the source for your screensaver. ( file extension ).

.sdml - Spatial Data Modeling Language format. Used for storing CAD and GIS data such as found in Landscape Planning, Design, and Architectural databases.

.sdn - Shareware Distribution Network format. Archive format.

.sea - Self Extracting Archive file format. A Macintosh file format similar to the PC .exe file format.

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.sf - Stream Format. A record format read and written to by CAD programs. See also .gds format.

.sgi - Silicon Graphics Image format. Native file format of the limage image library found on Silicon Graphics workstations. Also known as .rgb format.

.shar - Shell Archive. Shell script that expands into several files. ( file extension shar ).

.shg - Segmented Hyper-Graphic format. Used by Microsoft in the WinHelp on-line help facility found in Windows 3.1 to save a graphic and store the coordinates of specific areas known as "hotspots". When the user selects a hotspot, WinHelp jumps to another part of the help documentation via a hyper-text link macro stored in the .shg file.

.shk - ShrinkIt file format. An Apple II compression/archiving format.

.shtml - Server side HyperText Markup Language. An HTML document that contains extra information for server side includes. This has no effect on viewing the document. ( file extension ).

.sig - Small text file that can be automatically attached to the end of e-mail messages; usually includes the sender's name and e-mail address. ( file extension sig ).

.sit - Stuff It file format. Common Macintosh archiving and compression format. ( file extension sit ).

.snd - Sound. A file format used by a variety of different computers.

.spiff - Still Picture Interchange File Format. Intended to replace the .jfif file format, adding features (more colorspaces, a recognized way of including text blocks, etc.), and provding a backwards-compatability allowing SPIFF files to be read my most JPEG/JFIF decoders.

.srg - Software Self-Registry File (Microsoft Corporation).

.sql - Database file written in SQL (Structured Query Language); can be read by any SQL-compatible database program, such as FileMaker, MS Access, or MySQL.

.sqz - Squeeze It format. A file compressor and archiver that supports security envelopes, list files and creates self-extracting archives.

.swf - Macromedia flash animation file format, shockwave flash presentations. ( file extension swf ).

.swi - Swish Data File. Used in flash animation. ( file extension swi ).