Your requirement is a custom solution that depends on the logic of the application and it is not related to RadFileExplorer. Please note that (if you decide to implement it) you will need to make modifications in the logic of DBContentProvider in order to achieve the desired result.
In your case I suggest you check the implemented provider in this KB article
where the real paths (like C:\Folder1\Flder2) are hidden and replaced by custom defined paths. You can use a similar approach in your case.
I hope this helps.
the Telerik team