• Preview the file once the user select it.
• Callbacks for file selection, dialog closing:
  • OnDialogClose, OnFileChosen.

Open the legacy file explorer from anywhere using

LegacyOpenFileDialogHelper.OpenCustomFileDialog<PreviewView>(
      onFileChosen: chosenFilePath => MessageBox.Show(chosenFilePath)
);

Where PreviewView is a special UserControl that inherits from PreviewViewBase.

PreviewViewBase forces overriding PreviewCallback method, where it gives the path of the selected file so it could be possible to update the preview accordingly.

See Sample Application for complete demo.