Hi Yang,
Thank you for looking into implementing this. Sadly, I tried your package on my Win8.1 x86-64 machine, and found that not only did the new NPF service not start after uninstalling "real" WinPCap (running the installation tool manually, with the -il, and -i options didn't seem to do anything, until rebooting), and then your new NPCap in "compatibility mode", I had problems connecting to my WLAN, after rebooting (and I also received a BSOD, at one stage whilst trying to capture on multiple interfaces).
Unfortunately, I don't know if I can reproduce these issues, or provide any logging information, this time - but if I get chance, I'll have another look.
Take care,
Tyson.