open a pfx x509 certificate file

[adfm]

Hello all,

I started working with cryptopp and cryptography a couple of days ago
and I need some help. I know this is probably a newbie question,
but...

I have a certificate and I need to open it to extract the public key
in it. How on earth do I do it?!

I found an example on how to extract the public key in
http://www.cryptopp.com/wiki/X.509 written by Geoff Beier, but this
will only be the endpoint of my problem.

So the question is... How do I open the file? I need to give it the
password to open it... so...

Help ;)

Cheers