| File extension Name |
extension description |
| .$ | BASIC VB VB1D Komp Symbole File |
| .$#! | AOL 5.0 Virchk File (America Online, Inc.) |
| .$#! | Cryptext |
| .$$$ | Used by OS/2 to keep track of archived files |
| .$$$ | Temporary File |
| .$$$ | Backup |
| .$$A | OS/2 (IBM) |
| .$$F | OS/2 Database (IBM) |
| .$$M | 3D GameStudio Backup Map (Conitec Datasystems, Inc) |
| .$$P | OS/2 Notes (IBM) |
| .$$S | OS/2 Spreadsheet (IBM) |
| .$$_ | Midiprg Capella Compressed File |
| .$00 | DOS Pipe File |
| .$01 | Midi File |
| .$01 | DOS Pipe File |
| .$02 | Midi File |
| .$02 | DOS Pipe File |
| .$03 | DOS Pipe File |
| .$04 | DOS Pipe File |
| .$05 | DOS Pipe File |
| .$1 | ZX Spectrum-Emulator |
| .$A | AutoCAD Autosave File (Autodesk, Inc.) |
| .$AC | $&Sense Data File (Monogram Software/Software Toolworks/The Learning Company) |
| .$AC | AutoCAD Autosave File (Autodesk, Inc.) |
| .$B5 | Apple II ProDOS 16 or GS/OS Shell Application (Apple Inc.) |
| .$C | Graphics Converter Pro |
| .$D$ | OS/2 Planner Data File |
| .$DB | dBASE Temp File |
| .$DX | Ca Visual Objects Platform for Developer (CAVO) Backup Index File (CA) |
| .$ED | C Editor Temporary File (Microsoft Corporation) |
| .$ED | C/C++ Temporary Editor File (Microsoft Corporation) |
| .$EU | Midiprg Mustat Compressed File |
| .$ID | Cubase Compressed File (Steinberg) |
| .$LL | Cubase Compressed File (Steinberg) |
| .$LN | C++ TLink Response File (Borland Software Corporation) |
| .$NG | Midiprg Mustat Compressed File |
| .$OL | DOS Pipe File |
| .$ON | Cubase Fonts Compressed File (Steinberg) |
| .$RI | Cubase Audio Compressed File (Steinberg) |
| .$RR | Cubase Compressed File (Steinberg) |
| .$S | Graphics Converter Pro |
| .$TF | Cubase Fonts Compressed File (Steinberg) |
| .$VM | Windows 3.x Virtual Manager Temp File (Microsoft Corporation) |
| .$WM | Epson Creative Studio Example File (Epson Corporation) |
| .$XE | Mustat Compressed Audio File |