openconnect with p7b client certificate

[Mikołaj Stefaniak]

Hello,

I'm looking for some help with openconnect and p7b client certificate.
On Windows I can import p7b (that has no private key) certificate to 
windows cert store and later use it in AnyConnect. I would like to know 
if that is possbile in openconnect. If I convert p7b to pem certificate 
(without key) and use -c option, openconnect complains "Failed to 
determine type of private key".

Kind Regards,
Mikolaj