Doesn't save progress when stopping Windows service

The client saves its current progress when killed via md5_kill.xml, but not when the Windows service is stopped on machine shutdown. Since I run it on some slow machines that sometimes need hours to find the next DP and save their progress, I imagine this would save me some unnecessary double computations.

It's a trade off. I wrote the client to be as fast as possible. Saving state every X minutes is expensive. Saving it every DP or when a polite "kill" is requested, that doesn't effect performance.

Hope this helps.