| File Extension | Description |
| $A | Autosave file |
| $AC | Autosave file |
| AC$ | Autosave file |
| ADT | AutoCAD / AutoCAD LT Audit report file |
| AHP | AutoCAD / AutoCAD LT Help file |
| ATC | AutoCAD / AutoCAD LT Tool Catalog |
| AVI | Animation Video file |
| AWS | AutoCAD / AutoCAD LT Work Space |
| BAK | AutoCAD / AutoCAD LT Drawing backup file |
| BKn | Emergency backup file - n=sequential number |
| BMP | Windows Bitmap |
| CCP | CalComp color palette file |
| CDC | DesignCenter Preview Cache file |
| CFG | Configuration file |
| CHM | Complied HTML Help file |
| CSV | Comma Separated Value file |
| CTB | AutoCAD / AutoCAD LT Color-dependent Plot Style Table File (R2000 and up) |
| CUS | Custom Dictionary file |
| DCE | AutoCAD / AutoCAD LT Dialog Error Log (R2000 and up) |
| DCL | Dialog Control Language description file |
| DCT | Dictionary file |
| DIM | Dimension file |
| DLL | Dynamic linking library file or .NET Application file |
| DMP | AutoCAD / AutoCAD LT Error Dump file |
| DOC | MS Word Document |
| DWF | Design Web Format (once known as Drawing Web Format) |
| DWF | AutoCAD / AutoCAD LT Drawing interchange file |
| DWG | AutoCAD / AutoCAD LT Drawing file |
| DWL | AutoCAD / AutoCAD LT Drawing Lock file |
| DWT | AutoCAD / AutoCAD LT Template Drawing file |
| DXT | AutoCAD DXFIX Support |
| DXX | AutoCAD / AutoCAD LT Drawing Interchange Attribute |
| ERR | AutoCAD / AutoCAD LT Error Report |
| EXE | Application / Executable file or ADS Application file |
| FAS | AutoCAD / AutoCAD LT Fast-load AutoLISP File |
| FMP | AutoCAD / AutoCAD LT Font Map |
| GIF | Graphics Image Format file |
| HDI | AutoCAD / AutoCAD LT Heidi Device Interface File |
| HDX | Help index file |
| HLP | Windows Help file |
| HTM | Hypertext Markup Language File |
| HTML | Hypertext Markup Language File |
| INI | Configuration Settings File |
| JPG | JPEG Graphic Image File |
| LAS | Layer State file |
| LIN | AutoCAD / AutoCAD LT Linetype Definition |
| LOG | Log file |
| LST | Printer plot file |
| MDB | MS Access Database |
| MNC | Compiled Menu File (Windows) |
| MND | Menu Definition File |
| MNR | Menu Resource File (Toolbar and pull-down menu graphics images) |
| MNS | Menu Source File |
| MNU | Menu Template File |
| MNX | Compiled Menu File (Dos) |
| MPR | AutoCAD / AutoCAD LT Mass Properties Report |
| NFL | AutoCAD / AutoCAD LT Filter List |
| OLD | Backup of a file converted from earlier version of AutoCAD / AutoCAD LT |
| PAT | AutoCAD / AutoCAD LT Hatch Pattern Definition |
| PC2 | AutoCAD / AutoCAD LT Plot configuration File (R14/97/98) |
| PC3 | AutoCAD / AutoCAD LT Plotter Configuration File (R2000 and up) |
| PCP | AutoCAD / AutoCAD LT Plot configuration file (R13/R12/95/LT2 - before) |
| PCX | PCX Raster Image File |
| PGP | AutoCAD / AutoCAD LT Program Parameters |
| PIF | Program Interface File |
| PLT | AutoCAD / AutoCAD LT Plot File |
| PMP | AutoCAD / AutoCAD LT Plotter Model Parameters File (R2000 and up) |
| PNG | Portable Network Graphics |
| PPT | MS PowerPoint |
| PSF | PostScript Support File |
| RED | Autodesk View Redline |
| REG | Registration Entries (Windows Registry) |
| SCR | Script File |
| SET | AutoCAD / AutoCAD LT Set File |
| SHP | AutoCAD / AutoCAD LT Shape Source |
| SHX | AutoCAD / AutoCAD LT Compiled Shape or Font file |
| SLB | AutoCAD Slide Library |
| SLD | AutoCAD Slide |
| STB | AutoCAD / AutoCAD LT Plot Style Table File (R2000 and up) |
| SV$ | AutoCAD Autosave File |
| TGA | Truevision Format |
| TIF | TIFF Raster Image File |
| TTF | TrueType Font File |
| TXT | Attribute Extract Template File or ASCII Text File |
| UNT | AutoCAD / AutoCAD LT Unit Definition |
| WMF | Windows Metafile |
| XLG | AutoCAD / AutoCAD LT XREF Log |
| XLS | MS Excel Document |
| XMX | AutoCAD / AutoCAD LT External Message |
| XTP | AutoCAD / AutoCAD LT Exported Tool Palette |
| ZIP | Archive or Compressed Set of files |
