Sym
| Ext. | Description | Used by |
|---|---|---|
| ### | Temporary file | program-dependent format |
| #24 | Printer data file for 24 pin matrix printer | LocoScript |
| #IB | Printer data file | LocoScript |
| #nn | Part of file image | Long |
| #SC | Printer data file | LocoScript |
| #ST | Standard mode printer definitions | LocoScript |
| $$$ | OS/2 archive file (i.e. archives.$$$, keys.$$$) | OS/2 |
| $$$ | Temporary file | |
| $? | ZX Spectrum file in HOBETA format | |
| $00 | Pipe file | DOS |
| $DB | Temporary file | dBASE IV |
| $ED | Editor temporary file | MS C |
| $O1 | Pipe file | DOS |
| $VM | Virtual manager temporary file | Windows 3.x |
| )2( | LHA archiver temporary file | LHA |
| ??$ | Backup file | P-CAD |
| ??_ | Microsoft packed file | Expand |
| ?DK | Disk image | Loaddskf.exe |
| ?UT | Nonpacked FTN mail (? - flavor) | FTN software |
| !ut | Unfinished µTorrent download | µTorrent |
| ___ | Adinf table | Adinf |
| EX_ | Compressed executable file | Note: EX could be any first two characters in a file extension (e.g. BM_ for compressed bitmap (BMP), DL_ for compressed library, etc.) Files compressed using this method have been in use on Microsoft software CDs and floppies since around 1995. |
| ?Q? | Squeeze for CP/M and MS-DOS | |
| ~$~ | Temporary file | 1st Reader |
| ~?? | Old Backup files (.MNU to .~MN) | Resource Workshop (Borland Delphi) |
| ~H | Cardfile heap | AZZ Cardfile |
| μ | Metrowerks Codewarrior project | |
| Π | THINK C project | |
| @@1, @@2, etc. | Hidownload temporary file | Hidownload |
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