The FileExplorer is designed to load and show the contents of a single directory specified by the ViewPaths
<telerik:RadFileExplorer runat="server" ID="FileExplorer1">
UploadPaths="~/Images" DeletePaths="~/Images" />
If there are more folders listed in the ViewPaths
property then the control will list only the folders, but not their contents so that the user can choose which one to open.
All the best,
the Telerik team