use the following command:

JamShellLink.SelectionList.Clear();

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You can use TJamShellListItem.FullPath, or JamShellList.SelectedFiles, which will return a full file name that always includes the extension.

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Each Windows Shell extension may define which columns will be displayed for its view.To add or remove specific columns, use the OnCreateColumns event in combination with SetColumnVisibility. 

Example:
uses ShellBrowser;

procedure TForm1.JamShellListCreateColumns(Sender: TObject);
begin 
   with JamShellList do
   begin
       SetColumnVisibility(TShellColumns.Size, False);
       SetColumnVisibility(TShellColumns.Author, True);
    end;
end;

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This message is triggered by a handled excpetion. In the default configuration, RAD Studio stops on all exceptions, if handled or not. The end-user will not see errors like this for handled excpetions. Using exceptions for error handling is common in modern programming languages.
We recommend turning off this option:
"Tools > Options > Debugger Options > Language Exceptions > Notify on Language Exceptions".

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Use the OnKeyDown event like this and overwrite the Key value:

procedure TForm1.MyistKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
begin
   // suppress a FullRefresh by F5
   if (Key = VK_F5) then
      Key := 0;
end;

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