I accidentaly started "WSUS Offline Update CE ESR" to update a Windows Server 2012 R2 instance instead of "WSUS Offline Update CE" through a SMB share (e.g. \\192.168.0.163\wsusofflinece) and it stated that there was no medium for my instance (w63 x64 enu). When I'd go to "My computer", there was still a mapped drive letter to my SMB share. I believe it should be closed when the program ends, but it's not.