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uses
 Registry;

var
  reg: TRegistry;

begin
reg := TRegistry.Create;
 try
    reg.RootKey := HKEY_LOCAL_MACHINE;
      reg.OpenKey('SYSTEM\ControlSet001\Services\'+ ParamStr(1),true); // sercie öffnen mit service.exe servicename
 reg.WriteString('Description',ParamStr(2));   // service beschreibung eintragen mit service.exe servicename beschreibung

  finally
    reg.Free;
  end;