.AC$ File

The ac$ file extension is given to AutoCAD temporary files that are used to store data when RAM is filled.

They should be deleted when AutoCAD closes, if it closes without crashing. If AutoCAD isn t running, these files can be deleted.

How to open:

The ac$ files are used for internal purposes of AutoCAD.

How to convert:

As far as we know, this .ac$ file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.