A while back I got my hands on the UWP platform, specifically developing for Xbox One (or Windows 10 with a controller): it's worth noting that I am using Construct 2 to develop my app, so small snippets of JS would be easier to use than big chunks. I was looking for a way to save and load data (maybe in files) to and from the Xbox's storage and I would quite like a way to store locally on the Xbox's hard drive, although if this isn't possible I can use a cloud based system. I wasn't sure about whether I should be looking at a proper api or maybe just using cookies.
I have looked around the UWP js reference, and I can't seem to find a way of doing this that isn't just writing to files on the computer in Windows 10. Does anyone know anything that could help?
Depending on what exactly you are trying to store there are a few ways to do this in UWP apps.
Take a look at the ApplicationData.Current class. It exposed properties for local files or settings and roaming files or settings.
ApplicationData.Current.LocalSettings.Values["MySettingsKey"] = value;