There is only one file type that uses the .KYR extension:
Lotus Domino Key Ring File
Password-protected binary file that stores secure certificates on a Lotus Domino server; used for authenticating SSL and other secure connections; must be signed by a certifying authority to be valid.
The server's key ring filename appears in Internet Site documents configured by the server administrator. The default filename of the key ring generated by Lotus Domino/Notes is "KEYFILE.KYR."
Updated: August 3, 2008