because in this instance it's not an environment variable, it's a string based on their skype logon account details and different for each user (because otherwise they'd all have the same skype account).
I could create a script that created an environment variable just before logoff based on the folder name,
but
If they have two or more skype accounts, then they have several of these folders and I can't create an environment variable for each and also specify each in the ini file.