How can I export my key to a .p12/.pfx instead of .asc?

[STW]

I've sent an email to a user that's trying to import my key in an Enterprise-restricted Outlook 2010 email client but it appears that the only file formats that it will accept are P12 or PFX. Is there a way to output my public key in that format or convert the key once the ASC has been created?

[Rob]

Is there a way to output my public key in that format or convert the
key once the ASC has been created?

.p12/.pfx certificates are used with the S/MIME cryptography standard.
Enigmail uses the OpenPGP cryptography standard.