COB File Extension
COBOL Source Code Format
- File Type cob
- Popularity
- Application PSPad
- Category Developer Files
- Format Text
What is a COB file?
The COB file extension is linked to COBOL Source Code Format and belongs to the Developer Files category, which includes 1166 files.
COB files are compatible with various operating systems, including Linux, Windows and Mac OS. To open a COB file, you can choose from 4 programs such as Sublime Text, PSPad and Atom.
Programs that support COB files
How to open a COB file?
If you cannot open a COB 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.
Sublime Text, PSPad and Atom are recognized as the most popular software solutions for dealing with COB files. To set up the newest version of PSPad on your device, simply go to the official Jan Fiala website. There you can download the edition compatible with every operating system.
Once installed, PSPad will be set as the default program, and COB files will open automatically.
Set PSPad to open COB by default
Setting a default program by file type in Windows
- Right click on your COB file, then select "Open with" and click "Choose another application";
- Find the PSPad 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 COB files.
Change default apps on Mac
- Right-click or use Control + Left-click on the desired COB 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 PSPad. Check the box next to "Always open in app" to set it as the default program.
How to edit a COB file?
Editing COB files requires installing professional software that lets you open and edit developer files. Online editors have more limitations compared to dedicated COBOL Source Code Format programs.
Best COB editors in 2026
Considering the mentioned criteria, we have compiled a list of COB editors that may suit your needs.
| COB Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| PSPad | Jan Fiala | Windows | 4.7 out of 5 (41 review) |
| Sublime Text | Sublime HQ Pty | Windows, Mac OS, Linux | 4.6 out of 5 (39 reviews) |
| COBOL IDE Project | Eclipse Foundation | Windows, Linux | 4.2 out of 5 (40 reviews) |
| Atom | - | Windows, Mac OS, Linux | 4.1 out of 5 (36 reviews) |
Convert to and from COB
If you struggle with a COB file, consider converting it to alternative formats such as OBJ, FBX, S or other similar file types.
Converting a COB file may not fully retain all functionality, but it is generally possible to return it to the original format.
Convert COB to other file formats
Easy COB Troubleshooting
Certain problems with COB 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 COB file?
Open the corrupted COB 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 developer files.
How do I know if my COB file is corrupted?
Corrupted COB developer files may show the following signs:
- Attempts to open the file result in errors or failed results;
- Editing the archive in COBOL IDE Project is accompanied by slow performance or delays;
- The file causes PSPad or other programs to hang or crash during operation;
- Unexplained increase in COB file size;
- Error messages appear while working with the file;
What are the reasons behind PSPad crash?
The likely cause of PSPad crashing is lack of software updates. Install the latest updates available for Jan Fiala 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.