No worries, once I figured it out, I was able to load the saves. It's just a little messy, but a minor annoyance. You still made a solid game!
I figure, if it's based on nw.js, it does have Node.js on it. In which case, the path delimiter (in this case, you used backslash because windows) can be replaced by using
You must be registered to see the links
instead. Seems to be something for the dev of the plugin you used tho.
Disclaimer: I have no idea at all about RPGM scripting, I just have some experience as a backend node.js dev