DER File Extension
DER Certificate Format
- File Type der
- Popularity
- Application Microsoft Edge
- Category Blocked Email Attachment Files, Web Files
- Format Binary
What is a DER file?
Files with the DER extension are associated with DER Certificate Format and are categorized as Blocked Email Attachment Files and Web Files, making up 359 files.
DER file support extends to various operating systems, including Windows, Mac OS and Linux. When working with DER files, you can rely on 6 programs, including Microsoft Edge, Firefox and Internet Explorer.
MIME types
- application/pkix-cert
- application/x-x509-ca-cert
Programs that support DER files
How to open a DER file?
If you can’t open a DER 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.
When it comes to opening and working with DER files, Microsoft Edge, Firefox and Internet Explorer are the top choices for users. To install the updated version of Microsoft Edge, simply go to the Microsoft site and download the installer compatible with all major platforms.
Once the process is complete, Microsoft Edge should take over as the default application for DER files.
Set Microsoft Edge as the default DER program
Changing Default Programs in Windows
- Right-click on your DER file, then choose the "Open with" option and select "Choose another application" from the available options;
- In the pop-up window, select the Microsoft Edge application;
- Check the "Always use this application" checkbox, and then click "OK" to apply the selected application as the default for opening DER files.
Change Default Program on Mac
- Right click or Control + left click on the desired DER file;
- Select "Open in application" and click "Other";
- At the bottom of the window, you will find the "Enable" menu. Default, will be set to "Recommended Programs";
- Choose "All Programs" in this menu and search for Microsoft Edge. Check the box next to "Always open in app" to make it the default program.
Solve problems with DER files
Rest assured, any issues with DER files can typically be addressed with simple software adjustments. See the tips below for help.
Why does Microsoft Edge stop responding or crash intermittently?
Microsoft Edge crashes can be caused by outdated software. Keep your Microsoft products up to date by installing the latest updates.
Restarting your computer will solve many common problems, which is why it’s the first thing you should do before changing any settings related to the software.
What are the best practices for repairing a DER file that has gone bad?
Use a data recovery program to open the damaged DER file and from the menu choose "Repair" function to start the repair process. Allow the recovery process to complete, which will automatically repair the damaged blocked email attachment files.
What are the warning signs that my DER file may be corrupted?
Common indications of damaged DER blocked email attachment files are:
- Error messages appear during the course of working with the file;
- Opening the file results in an error or a failed attempt;
- Unexpected expansion of the total size of the DER file;
- Opening the file in Microsoft Edge or other programs causes them to hang or crash;