I created a folder on my Win7 Pro machine, set it to encrypt contents to protect data. Then I opened MMC, added the Certificates snap-in for "my user account", expanded Certificates - Currrent User > Personal > Certificates and exported my certificate with the private key to a network share as an .PFX file.
On the WinXP Pro machine, I went to the network share, located the cert and installed it. Then I went to the folder on the Win7 pc using UNC path and tried to copy the file from there to the XP machine's desktop, and it said access denied. But it would let me delete the file. I just couldn't copy or preview it.
Am I missing something?