Can I access Electron's HTML/CSS via app.asar?

I'm testing a desktop app being built in Electron. Since the app’s layout is CSS/HTML based, I was hoping to do simple layout modifications without access to the source material. Even if I can't see my mods in the running app, it would be useful to extract HTML/CSS/JavaScript templates, modify these and see the results in a browser.

Question 1: Is the above possible?

Based on this question I'm assuming app.asar could be what I'm looking for, but being on Windows 10, it seems that installing asar (and Node, NPM, Python and Visual Studio) just to unarchive files is discouraged.

Question 2: Can I access the files presumed to be inside app.asar without installing all the stuff mentioned above?