I am not quite sure that I understood your requirements. I suppose, however, that you need the RadFileExplorer control to acts as a DataSource control and to serve content to a DataGrid. If so, please note that RadFileExplorer control uses a ContentProvider model which allows it to be connected to any kind of datasources (DataBase, Amazon S3, etc.), but this model can be used by the RadFileExplorer only (RadFileExplorer is used in the RadEditior's dialogs as well) and cannot be used by external controls, like DataGrid.
In your case you need to implement your custom code that will fetch the files/folders from the file system and send the information to the DataGrid control. You can use the
method shown in this RadRotator's demo
(the codebehind file) as a base in order to achieve the desired result.
I hope this helps.
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