How do I Stop Windows from bringing up file explorer on login.

Immediately after setting up my Bootcamp partition to also run as a VM it started to automatically open a File Explorer window when I signed in. This happens whether I bring up the partition as a VM or in native mode. I looked in the startup folder, shell:startup, and in the Task Manager startup tab but I don't find it. Anyone know how it is being started and how I can stop it?