application/x-pkcs7-certreqresp

x-pkcs7-certreqresp and the .p7r extension were also introduced by Microsoft. Likely yet another alias for pkcs7-mime.

File types

.p7r

Also appears as

application/pkcs7-mime
Deprecated

Further reading

  1. IETF - Internet Engineering Task Force (RFC 5273)
  2. PKI Tutorial

Related to

No related mimetypes listed