Hi Scott, and welcome to AF

No, nothing to do with anything you've downloaded. It's using part of the internal storage to emulate an sd card. I imagine you'll find that /storage/emulated/0 is the same as /sdcard, just different ways of addressing it.

 

This is one of the most ill-thought out parts of Android.

If you are familiar with Unix you will know that there are links and symbolic links which are used to refer to a storage location. They are rather like the index entries in a text book. More than one entry in the index can refer to the same section of the book.

Android has a thoroughly confusing multiplicity of ways to refer to the internal and external storage locations as well as several names for them. I am an old hand at Unix but I still find the numerous ways in which the storage areas in Android are referred to confusing but Hadron is spot on. This is nothing to do with anything you have downloaded or to do with emulators.