how to call npm in nw.exe (node-webkit) instead of nodejs.exe?

I am using node-webkit https://github.com/rogerwang/node-webkit on windows. I want to use npm to update package "request" or any other package. I have not installed nodejs on windows. I found npm.cmd needs nodejs.exe. Is there anyway that I can run/ call npm with node-webkit instead nodejs.exe? node-webkit gives nw.exe.

Thanks, regards, Maheshwar

We called npm as child process. We write update.bat as "npm update package" Now, npm auto updates our package like windows update.