Hello,
The content displayed in the Rename dialog is the name of the FileItem listed in the RadFileExplorer and it is not possible to modify it.
Could you please provide more detailed information why do you need to modify the Name property in such manner? If you want to implement some sort of 'download' functionality please take a look at the following live demo:
FileExplorer - Filter files and download
Regards,
Dobromir
Telerik
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