How to open .DER file extension?

If you cannot open a new file that has been saved in the .DER format you need to download the appropriate software. The manufacturer of .DER files is N/A; .DER files belong to the Web Files category. After downloading the application from the list available on our website just run an unknown file, and as the default set the newly installed application supporting the .DER files. Activities performed in the order described should solve the problems with all the files in the .DER format.

• What is .DER file?
• How to open .DER file?
• What is .DER file?