[delphi.com.ar]

Yo he probado este código, que es el que ofrece cadetill con algún cambio sutil, y funciona.

function GetFileVersion( AFileName : String ) : string;
var
  Size,
  Size2 : DWord;
  Pt,
  Pt2   : Pointer;
begin
  Size := GetFileVersionInfoSize(PChar(AFileName), Size2);
  if Size > 0 then
  begin
    GetMem(Pt, Size);
    try
      GetFileVersionInfo (PChar(AFileName), 0, Size, Pt);
      VerQueryValue (Pt, '', Pt2, Size2);
      with TVSFixedFileInfo (Pt2^) do
        Result:= Format('Versión %d.%d Build %d.%d', [ HiWord(dwFileVersionMS),
                                                       LoWord(dwFileVersionMS),
                                                       HiWord(dwFileVersionLS),
                                                       LoWord(dwFileVersionLS)] );
    finally
      FreeMem (Pt);
    end;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Caption := GetFileVersion( 'C:\WINDOWS\Moricons.dll' );
end;