[Inno Setup] Exec ShellExec 等待与否 参数

TExecWait = (ewNoWait, ewWaitUntilTerminated, ewWaitUntilIdle)

var
  ErrorCode: Integer;
begin
  if not ShellExec('', ExpandConstant('{app}filename.rtf'),
     '', '', SW_SHOW, ewNoWait, ErrorCode) then
  begin
    // handle failure if necessary
  end;
end;