While searching for an answer to the question - How to open the DER 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 DER file. Each program contains a different type of data and you need specialized software to properly work with the DER file. Here is a list of programs that are designed to work with the DER 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 | DER Encoded Internet Security Certificate Format |
| Developer | Lack of information |
| Popularity | |
| Share |
If after installing the program from a list, you still cannot open a file with the DER extension, the reason may be that the file is damaged. The solution may be to find a new copy of the DER 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 DER 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 DER 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 DER file using the program installed earlier.
Entries containing links of the DER 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 DER file. In this case, such a file will definitely not be opened. Download a good antivirus program and scan the DER file mentioned. If the antivirus application detects malicious data, it may signify that the DER file is infected.
| DEVELVE | Develve Format |
| DEV | Windows Device Driver Format |
| DESC | Description Format |
| DED | Dr. Engrave Document Format |
| DEF | Definition Format |
| DEU | Adobe Reader German Language |
| DECRYPT | Microsoft Windows 8 Decrypted ESD Format |
| DEK | Magic The Gathering Deck Format |
| DEFINITION | Apple Mac OS X Automator Data Type Definition |
| DE | German Language Translation |
