HTTPSecureSocket Documentation a little thin?

I’m working on a project where I need to connect using a HTTPSecureSocket with a client certificate and I’m finding the documentation almost non-existent, but perhaps I’m looking in the wrong place(s). In the LR I see the Certificate file is a folder item, and in RS2012 I see the elipses button to select a folder?. In Xojo there are is no elipses button, and entering a folder path crashes the IDE.

I would have thought that a client file (.PEM) would be required so why the folder in 2012 and a simple textfield in 2013?

Any suggestions would be appreciated.