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.der file extension

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.der
DER Encoded X509 Security Certificate file. This is a binary file, which contains a security certificate.

cf .cer, .crt

Can you add to this? Do you know of any applications not already listed which will work with .der files, view .der files or open .der files? Are you able to contribute any additional reference information or file format information about .der files or have you spotted any errors or omissions? If so please let us know by emailing us at feedback@cryer.co.uk - Thank you.