Hi backin2shape,
I believe this will give you the details you need:
Open a command prompt (CMD) and go to the installation folder of the client, something like "C:\Program Files (x86)\PGP Corporation\PGP Desktop".
There type:
pgpnetshare --list "path_to_the_folder"
Nonetheless, if you don't have access to the private key of the key you find listed, you will not be able to access that data.
I'm not sure if this works, but in case you have read access (you are a simple user of that encrypted share) you can try creating a new netshare folder and copying the contents.
If you don't have access, at least, to the public keys, the output will only be the key ID. You will need to find the owner of the key by that key ID.
HTH,
dcats