| Abbreviation | Definition |
|---|---|
| SWP | Swap file |
| SWQ | Stream Water Quality Input File |
| SXP | 3D Studio Process file |
| SY1 | Ami Pro Smartpix symbol library |
| SY3 | Harvard Graphics 3.x Symbol file |
| SYD | QEMM - Sysedit Backup |
| SYK | Excel Symbolic link spreadsheet format |
| SYLK | Microsoft Symbolic Link spreadsheet format |
| SYM | Borland C++ Precompiled header |
| SYM | Graphics symbols |
| SYM | Program SYMbol table (compilers and linkers) |
| SYM | Symbols |
| SYN | MicroSoft Word 5 SYNonym file |
| SYN | SDSC Synu image file Bitmap graphics |
| SYNU | SDSC Synu image file Bitmap graphics |
| SYS | DOS System file - device driver or hardware configuration inforiation |
| SYS | SYGRAPH - SYSTAT Data file |
| SYW | Harvard Graphics for Windows Graphics symbols |
| SYW | Yamaha SY-85/SY-99 Wave File |
| SYX | SysExpert file dumps |