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You may use SetFileAttributes function, if you want to set or change file attributes. This example shows, how to set FILE_HIDDEN attribute.

procedure TForm1.Button1Click(Sender: TObject);
begin
  with OpenDialog1 do
    if Execute then
      if SetFileAttributes(PChar(Filename), FILE_ATTRIBUTE_HIDDEN) then
        Caption:='attribute was changed'
      else
        Caption:='attribute was not changed';
end;

Related topics

All information about file

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Win32 programmer's reference

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