CDU File Extension

CDU Paint Image Format
- File Type cdu
- Popularity
- Application XnView
- Category Graphics Files
What is a CDU file?
The CDU file extension is linked to CDU Paint Image Format and belongs to the Graphics Files category, which includes 556 files.
CDU files are supported by Windows, Linux and Mac OS. When working with CDU files, you can rely on 2 programs, including XnView and Recoil.
Programs that support CDU files
How to open a CDU file?
If you can’t open a CDU file, it is usually because the necessary software is missing. To resolve the issue, select the right program from the list for your operating system. Then go to the official website of the developer, download the software, and install it.
The most popular programs for working with CDU files are XnView and Recoil. To install the latest version of XnView on your computer, visit the Gougelet website where you can download the version available for all operating systems.
Following installation, CDU files should be automatically opened with XnView.
Set XnView as your default CDU viewer
Changing the default program in Windows
- Right-click on your CDU file, then choose the "Open with" option and select "Choose another application" from the available options;
- From the list of applications in the pop-up window, find and select XnView as your desired application;
- Check the "Always use this app" checkbox, and then click "OK" to set your chosen app as the default for opening CDU files.
Set default app to open files on Mac
- Right-click or Control + left-click on the desired CDU file to open a menu of available actions;
- Select "Open in application" and click "Other";
- Look at the bottom of the window, where you will see the "Enable" menu. "Recommended Programs" will be selected as the default option;
- Within this menu select "All Programs" and navigate to XnView. Check the box next to "Always open in app" to make sure it’s the default option.
Solving Common CDU File Challenges
When issues arise with CDU files, they can generally be fixed with small software tweaks. Use the troubleshooting tips below to help resolve them.
What are the warning signs that my CDU file may be corrupted?
Corrupted CDU graphics files may have one or more of the following symptoms:
- Error messages appear during the course of working with the file;
- Attempts to open the file result in errors or failed results;
- Unexplained increase in CDU file size;
- The file causes XnView or other programs to hang or crash during operation;
Why does XnView crash?
XnView crashes can be caused by outdated software. Keep your Gougelet products up to date by installing the latest updates.
A simple restart of your computer can often fix many common problems, which is why it is the recommended first step before making any adjustments to your software settings.
How to repair a corrupted CDU file?
Use a data recovery program to open the damaged CDU file and from the menu choose "Repair" function to start the repair process. Please be patient while the recovery process completes, which will automatically restore the damaged graphics files.





