Thanks for the reply, but no good. Again excuse my rant, I highly doubt it will be heard by someone of importance but this is a major issue I believe needs attention.
I've spent another few hours today researching my issue, it turns out that Windows Store apps are completely locked down and completely ignore permissions changes. The only workaround is running Linux which completely ignores permissions set by windows but I don't want to be doing that when there should ideally be a way to fix this from within Windows.
I am also coming across other issues with this particular game, which can be fixed by editing one file contained within the game folder, but due to lack of permissions I can't fix it.
So, need to edit that one line in a config file contained within the apps' folder as it is an option set by a variable in a text file, but not within the UI of the game/app itself? Need to edit a word in the executable with a hex editor so it runs more stable on your system? Need to install an addon or plugin for the app that reads from a subfolder in the main directory? Want to install a mod or two for a game/app as you have finished it and want to play it again but differently? Well, thats too bad, M icrosoft says no. This is not an issue with other platforms such as Steam, Epic Games' Launcher, Blizzard App, Origin, or uPlay to name a few of the more popular 'stores'. This is a completely isolated issue with the Windows Store.
It may be intended to stop viruses/malware/piracy but when someone wants to modify files on their own system, they should be able to. This not only ruins the experience for the end user if they do need to make necessary changes to an app or game (and can't), but it hurts the developer as well, since if the end user is getting a bad experience they are much less likely to purchase from them in the future.
I will be avoiding Windows Store apps like the plague from now on. This is absolutely ridiculous, Microsoft.