不要用 os.system()   會因為系統語言和中文導致失敗 

#coding=utf-8

import os
import sys
import win32api
import win32process
import time
import win32event
import threading

helplFile = r'D:\程式設計軟體Basic Studio\雷賽運動控制器API函式程式設計手冊V1.5.pdf'
exePath = r'C:\Program Files (x86)\Foxit Software\Foxit Reader\FoxitReader.exe'

handle = win32api.ShellExecute(0, 'open', helplFile, '', '', 1)

print('wait for end')
#等待程序結束
print(win32event.WaitForSingleObject(handle, -1))
print('close it')