fix startfile() issue.
fix startfile() issue.

Changes to be committed:
	modified:   weixin.py

bobolau/wxrobot,yzxky/WeixinBot,bobolau/wxrobot,Urinx/WeixinBot,yanxurui/WeixinBot,Urinx/WeixinBot,yanxurui/WeixinBot,yzxky/WeixinBot