My usual technique for opening a directory in Windows Explorer from the command line is to enter the command "Start DirectoryName", and this works fine. For instance "Start ." to open the current directory, "Start .." to open the parent directory, "Start Z:\" to open the root directory, and even "Start ADirectoryName" to open Explorer window on the directory named "ADirectoryName". However, if the previous directory was named "A Directory Name" then`Start "A Directory Name"` would open a stand-alone TCC session. Now there is a fairly simple work around available (if short file names are enabled): `Start %@SFN["A Directory Name"]` works just fine because the short file name does not (and can not) contain any spaces. But the question is: Why is this necessary?