One of many good reasons to shun Microsoft Store apps. The entire design of it is backwards and abysmal.
IDL is basically opaque binary data that the Windows Shell can turn into a path. It can be useful, but finding the data isn’t always easy, and is usually done by dragging something to a toolbar. But first you have yo find that thing, which the design of the Microsoft Store actively tries to prevent you from doing, for reasons no one can explain.