COF File Extension
AutoDesk Data Format
- File Type cof
- Developer Autodesk
- Popularity
- Application AutoCAD
- Category Text Files, Data Files
- Format Binary
What is a COF file?
The COF file extension is linked to AutoDesk Data Format and belongs to the categories of Text Files and Data Files, which include 6511 files.
The AutoDesk Data Format (COF) was developed by Autodesk, which created file format and 45 programs to work with them.
COF files are compatible with various operating systems, including Windows, Mac OS and Linux. To open a COF file, you can choose from 2 programs such as AutoCAD and AutoCAD Civil 3D.
Programs that support COF files
How to open a COF file?
If you cannot open a COF file, it is most often due to missing software. Select a program from the list according to your operating system. Then go to the official website of the program developer, download it, and install it on your device.
AutoCAD and AutoCAD Civil 3D are recognized as the most popular software solutions for dealing with COF files. To set up the newest version of AutoCAD on your device, simply go to the official Autodesk website. There you can download the edition compatible with every operating system.
Once installed, AutoCAD will be set as the default program, and COF files will open automatically.
Set AutoCAD to open COF by default
Setting a default program by file type in Windows
- Right click on your COF file, then select "Open with" and click "Choose another application";
- Find the AutoCAD application in the pop-up window and select it as your preferred program;
- Select the "Always use this application" check box and click "OK" to save your selection as the default application for opening COF files.
Change default apps on Mac
- Right-click or use Control + Left-click on the desired COF file to access the file’s context menu;
- Select "Open in application" and click "Other";
- At the bottom of the window, find the "Enable" menu, where "Recommended Programs" is already selected by default;
- Within this menu, select "All Programs" and then locate AutoCAD. Check the box next to "Always open in app" to set it as the default program.
How to edit a COF file?
Editing COF files requires installing professional software that lets you open and edit text files. Online editors have more limitations compared to dedicated AutoDesk Data Format programs.
Best COF editors in 2026
Considering the mentioned criteria, we have compiled a list of COF editors that may suit your needs.
| COF Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| AutoCAD | Autodesk | Windows, Mac OS | 4.4 out of 5 (37 reviews) |
| AutoCAD Civil 3D | Autodesk | Windows, Mac OS, Linux | 4.2 out of 5 (38 reviews) |
Easy COF Troubleshooting
Certain problems with COF files can be conveniently fixed with small software tweaks. Here are some helpful tips to address them.
What are the steps to repair a damaged COF file?
Open the corrupted COF file in a recovery program and select the "Repair" menu item. Please be patient while the recovery process completes, which will automatically restore the damaged text files.
How do I know if my COF file is corrupted?
Corrupted COF text files may show the following signs:
- Attempts to open the file result in errors or failed results;
- Editing the archive in AutoCAD Civil 3D is accompanied by slow performance or delays;
- The file causes AutoCAD or other programs to hang or crash during operation;
- Unexplained increase in COF file size;
- Error messages appear while working with the file;
What are the reasons behind AutoCAD crash?
The likely cause of AutoCAD crashing is lack of software updates. Install the latest updates available for Autodesk products.
Restarting your computer is often an effective solution to resolve various common problems. Therefore, it is recommended to do so before making any changes to the software configuration.