Adding personal/user cert to Nokia E70?

Hi,
How would I go about adding a personal cert to an E70? I've been
able to add a DER-format cert by writing a CGI that presents it as
x-x509-ca-cert but when I try to use x-x509-user-cert the web browser
doesn't understand that file format, and when I save the file there's no
way for me to add it. Beaming the file via bluetooth fails because the
mailbox doesn't know what the filetype is.

Is there something I should be naming these cert files? I'd
prefer to use bluetooth instead of some CGI over GPRS Rube Goldbergery..

TIA!
--
"When in doubt, use brute force."
- Ken Thompson