procedure ShellExecAndWait(dateiname: string; Parameter: string);
var executeInfo: TShellExecuteInfo;
dw: DWORD;
begin
FillChar(executeInfo, SizeOf(executeInfo), 0);
with executeInfo do
begin
        cbSize := SizeOf(executeInfo);
        fMask := SEE_MASK_NOCLOSEPROCESS or SEE_MASK_FLAG_DDEWAIT;
        Wnd := GetActiveWindow();
        executeInfo.lpVerb := 'open';
        executeInfo.lpParameters := PChar(Parameter);
        lpFile := PChar(dateiname);
        nShow := SW_SHOWNORMAL;
end;
if ShellExecuteEx(@executeInfo) then
        dw := executeInfo.HProcess
else
begin
        ShowMessage('Fehler: ' + SysErrorMessage(GetLastError));
        Exit;
end;
while WaitForSingleObject(executeInfo.hProcess, 50) <> WAIT_OBJECT_0 do
        Application.ProcessMessages;
CloseHandle(dw);
end;