This property can be used to get a character that is used in a directory string.
Notes to Inheritors
When you inherit from IsolatedStorage, you can override SeparatorExternal and return a character other than the '\' to control the naming syntax of the store. In a Windows IsolatedStorageFile this separator is a '\'.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2