For example in the Xbox app if you choose to install a game to a different drive, these location will be on that drive.
The default locations for the above are not reliable. We need an alternative method (see below). 
Similarly, attempting to start an app by executing the EXE directly won't work. You need an alternative method to determine an app's version. This also means reading the EXE to obtain version information is a non-starter. This is the major reason why script extenders (xSE) and tools that utilize their own virtual file systems - which hook into the executables, don't work). Clearly the rational is modifying assets is OK, but modifying the executable opens the system up to vulnerabilities. They show up in the File Explorer, but to most programs they do not exist or at the very least cannot be opened or run, resulting in errors (ie: The device object parameter is either not a valid device object or is not attached to the volume specified by the file name: 'C:\\Program Files\\ModifiableWindowsApps\\Skyrim Special Edition (PC)\\SkyrimSE.exe from a python script). Note: Even though this is the most modifiable location, executables (EXEs) still act very abnormally here. The default location for these is at %PROGAMFILES\ModifiableWindowsApps. This is where you should be reading/writing to to modify an app. Apps that intend to be modifiable (ex: Bethesda games) provide this location. This works similar to other virtual file systems: you can modify/edit/create files here, and any changes override whatever is in the actual virtual filesystem. 
Some apps provide a "Mutable" view of the files. While this is the closest you can get to an actual filesystem view of the files for the app, due to the permission issues you should basically never access these locations. A highly protected (read: permissions are strictly controlled, and even taking ownership is difficult) view is available at the default location of %PROGRAMFILES%\WindowsApps\. The virtual filesystems are in %PROGRAMFILES%\MSIVS\. All of the actual files are stored in a virtual file system. Windows Store stores its games in a virtual file system, and provides a few links into that virtual file system with varying properties. Note there are varying names given to this platform, all or some might be used by different authors: Windows Store, Microsoft Store, and Game Pass. Detecting games that are installed via the Microsoft Store is much more complicated than usual games, due to the way Windows stores them on your hard-drive.
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