Opening an AC$ File

The AC$ file type is primarily associated with AutoCAD.

AC$	File extension: AC$
	File type:	Undo Info

What is an AC$ file?

AC$ files mostly belong to AutoCAD by Autodesk, Inc. Use our "Online AC$ Text Viewer" below to analyze your AC$ file and to see all text it contains.

How can I open an AC$ file?

You need a suitable software like AutoCAD to open an AC$ file. You need a suitable software like AutoCAD from Autodesk, Inc. to open an AC$ file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your AC$ file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a AC$ file directly in the browser:. Just drag the file onto this browser window and drop it.

Online AC$ Text Viewer

Choose your .ac$ file to analyze

or drag and drop it here

Online File Viewer

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Unable to Open a .AC$ File? Quick Solutions:

Because .AC$ files can originate from various programs, they aren't universally openable.

Identify the Source: If received from a drafter, it is likely an AutoCAD Undo Info file. If found in system folders, it may be a generic temporary file.
Check the Header: Open the file in a text or hex editor to inspect the first bytes:
- "PK" indicates a zipped archive.
- Readable XML suggests a configuration file.
- Binary data points to a proprietary cache.
Use the Original Software: The original program is usually required; try Autodesk AutoCAD, or ask the sender if uncertain.
Use this Webpage: Drag and drop your file here to detect its format, extract readable text, and preview contents.

Technical Data for AC$ File Extension

Program ID:

AutoCADLTTempFile, AutoCADTempFile

Related files:

ac, ac%24, sv%24, acs, sv$, sv, dwl, dwl2

an ac$ Undo Info is a special file format by Autodesk, Inc. and should only be edited and saved with the appropriate software.

How to solve problems with AC$ files

Associate the AC$ file extension with the correct application.
Update your software that should actually open undo infos. Because only the current version supports the latest AC$ file format. Search, therefore, e.g. on the Autodesk, Inc. manufacturer website after an available AutoCAD update.
To make sure that your AC$ file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .AC$ file online - secure, fast, and no downloads needed.