http://bugs.winehq.org/show_bug.cgi?id=11070
--- Comment #7 from Mark Smith mhs@hp.com 2008-01-09 00:26:47 --- An example (make your own .p12 blob) may be found here: http://www.flatmtn.com/computer/Linux-SSLCertifcatesPKCS12.html
First, however a root certificate must exist in order to sign the thing, (OpenSSL's CA.pl script can create one)