While searching for an answer to the question - How to open the AC$ file? - you probably found websites, which offer software that was able to open any file extension. Do not be fooled, there is no one program that will allow you to work with any file extension, including the AC$ file. Each program contains a different type of data and you need specialized software to properly work with the AC$ file. Here is a list of programs that are designed to work with the AC$ file - remember, these applications are able to open at most a few file extensions, they are designed to work with a specific data type.
| File type | AutoCAD Undo Info Format |
| Developer | Autodesk |
| Popularity | |
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If after installing the program from a list, you still cannot open a file with the AC$ extension, the reason may be that the file is damaged. The solution may be to find a new copy of the AC$ file you want to open
In this case, the easiest way is to use the tool built into the operating system for association of the AC$ file with applications to support it. Double click on the file you cannot open - the operating system will display a list of programs that are likely to work with your AC$ file. Choose one of them, or select the location on a disk where you installed one of the applications from our list. Windows should then open the AC$ file using the program installed earlier.
Entries containing links of the AC$ file extensions with applications is located in the HKEY_CLASSES_ROOT. If you do not know how to get to the Windows Registry, or how to make changes in it, ask a specialist for help. Lack of knowledge on the subject may cause irreversible changes on your computer.
There may be a situation when a computer virus passes itself off as the AC$ file. In this case, such a file will definitely not be opened. Download a good antivirus program and scan the AC$ file mentioned. If the antivirus application detects malicious data, it may signify that the AC$ file is infected.
| ACCDA | Microsoft Access 2007/2010 Add-in Format |
| ACROPLUGIN | Adobe Acrobat Plug-in Format |
| ACW | Microsoft Accessibility Wizard Format |
| ACS | Microsoft Agent Character Structured Storage Format |
| ACE | WinACE Compressed Ace Archive Format |
| ACSM | Adobe Content Server Message Format |
| ACD-ZIP | Sony ACID Compressed Project Format |
| AC3D | 3d Format Data |
| ACTX | DS Game Maker Action Description Format |
| ACT | Adobe Photoshop/Illustrator Color Table |
