Using Win 8 Task Manager to reveal the folder location of modern apps
On the Task Manager > Details tab
Adding the Package Name column (right click one of the existing column) will discover which process host each Modern UI app.
For apps that run under native / manage code compiled process you will see the exact process running (like webcam.exe that run the Camera app in the picture above )
Right click the process and choose Open File location to open the folder that contain the app files ( something like C:\Program Files\WindowsApps\Microsoft.Camera_xxx.x.xx.x.x… )
Please note that this folder is protected and you don’t have access to this folder by just browsing to C:\Program Files\WindowsApps – you will get access denied message.
However using the Manager Open file location you will get to that folder.