The File Extensions Database

.AC$ File Extension

  • Developer by: Autodesk
  • Category: Misc Files

What is an .AC$ file?

.AC$ is AutoCAD Temporary File

Temporary file generated by AutoCAD, a 2D/3D drawing and design program; contains information used by various commands, including "UNDO" and "HIDDEN LINES."

AC$ files do not contain any drawing data and only exist when AutoCAD is open. They are automatically deleted when the program is closed.

Programs that open AutoCAD Temporary File
Autodesk AutoCAD 2018

How to solve problems with AC$ files

  • Associate the AC$ file extension with the correct application. On :
    Windows: Right click on any AC$ file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.AC$ files". Mac: Right click (or Ctrl-click) the AC$ file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .AC$ is AutoCAD Temporary File. Because only the current version supports the latest AC$ file format. Search, therefore, e.g. on the Autodesk manufacturer website after an available .AC$ is AutoCAD Temporary File update.
  • To make sure that your AC$ file is not corrupted or virus-infected, get the file again and scan it with antivirus software.