To try and fix a problem, somebody said "Edit XenCenterMain.exe.config" (doesn't matter why) but didn't say where the file was so I searched my hard drive and found it in two locations:
"C:\Users\rob.nicholson\AppData\Local\VirtualStore\Program Files (x86)\Citrix\XenCenter\XenCenterMain.exe.config" "C:\Program Files (x86)\Citrix\XenCenter\XenCenterMain.exe.config"
What's this VirtualStore all about in Windows 7? One of them appears to be a junction - right term? When I edit one of them, the other also updates.