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.

1. 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.
2. 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.
3. Use the Original Software: The original program is usually required; try Autodesk AutoCAD, or ask the sender if uncertain.
4. Use this Webpage: Drag and drop your file here to detect its format, extract readable text, and preview contents.

AC$ file format:

If you can determine the file format, the associated program can also be determined. Each file format has a unique extension and almost always a unique signature. For example, Microsoft Word documents have the extension .docx and the signature (usually the first 3 characters in this file) PK. However, different programs can use the same file extension. Furthermore, a file extension can be renamed incorrectly and double-clicking on it will then display an error when it is opened. So a detailed analysis of a file is vital in order to determine the format and the associated program. In the following you will find our evaluation of the AC$ files:

AC$ is seldom used as a file extension and does not have a uniform file format. But the following two file formats are common:

• 9% of all AC$ files start with the magic bytes 02 E0, which are always the first bytes of this file format. The content consists of illegible binary data, which can only be read and interpreted by the associated programs. The file size is in the range of 10 KB to 1 MB.
• 5% of all AC$ files start with the bytes AC10 crucial for this file format. These files are binary files, so they do not contain text, but only cryptic characters. AC$ files are between 730 KB and 24 MB in size.

The remaining 86% of all AC$ files are files with no common format. These files are often connected to undb or unde. Drag & drop your file here to see the file format and a preview of your AC$ file!