Thank you for writing.
I assume that you are asking about RadBrowseEditor. If so, yes you can access the OpenFileDialog and introduce the desired settings:
(radBrowseEditor1.DialogType == Telerik.WinControls.UI.BrowseEditorDialogType.OpenFileDialog)
OpenFileDialog dialog = (OpenFileDialog)radBrowseEditor1.Dialog;
I hope this helps.
the Telerik team
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