When you go to">Folder and search options>view> scroll down> Now take a screen with snipping tool and post it here also right click on script.lua and click properties and take a screen shot with snipping tool and post it here as well. I got the problem thats why I'm saying this. Anyways also right click on script.lua and rename it script.lua > Now right click on méta.xml and rename it meta.xml
http://pbrd.co/1fGGYr0 I didn't scroll the whole way down I assumed you just wanted to see the "Hide extensions for known file types"