debug child_process.fork is ok to open new window，but package app did not use child_process.fork？

[floydcash]

I use "nw app" to open a folder，debug it，and use child_process.fork("./child") to open
a child_process，this child_process can open other index.html in child folder，this folder has a package.json file。

but when I package the app to app.exe，this app.exe can not use child_process.fork，nothing error to show？

How can I do？

[kingFighter]

@floydcash This is duplicate with #1057 #213