I need to copy some files inside WindowsApps folder

I am not sure if this is the right place to ask, but this my question:

I need to copy some files into this folder:
C:\Program Files\WindowsApps\Microsoft.FlightSimulator_1.18.15.0_x64__8wekyb3d8bbwe

The pourpose of copying the files (reshade files) is to add an 3D effect to the game. I can do this with other games without any problem, but MSFS is located in WindowsApps folder (a system folder very well protected). This is my 1st Windows Store game, and I can not be more unpleasent with the folder dsitribution and this type of restrictions making imposible to modify things. I know Steam buyers can use reshado without problem, but Windows Store users we have a terrible problem with this WindowsApps folder.

I have get access to the WindowsApps folder following google instructions, but I can not find out how to copy any file inside. I always get the message that there is not enough space. I am loosing a lot of time trying to solve something and I should not to. Just why store a game in a system folder with so many restrictions? I don’t understand.

I just want to have normal access to the game folder to copy some files, that is all.