Slashes in URLs are converted into backslashes on Windows

[achimnol]

I'm using node.js 0.12.4 on Windows 8.1 64bit and have installed vulcanize by npm install -g vulcanize as instructed. The compilation process goes fine without warnings nor errors.

Surprisingly, I see some images and CSS styles are missing after vulcanizing because it has converted all slashes in every URL into backslashes!
For example: background-image: url(somepath/somefile.png) => background-image: url(somepath\somefile.png) and the browser is trying to load "somepathsomefile.png". In some contexts, they are converted again into percent-encoding, %5C.
Loading the original codes in the browser works perfectly fine but only the vulcanized code has missing resources like this. This issue does not happen on Mac and Linux.