I am not quite sure what type of customization you make - could you please provide little bit more information about this? I suppose, however, that you need to change the localization of the RadFileExplorer
control. If so, you need to use the localization files RadEditor.Dialogs.xxx.resx
and change the desired text. More details on the subject can be found in this forum thread.
I hope this helps.
the Telerik team