I am trying to get rid of a few old URLs from the drop down when I sign into MS addins. Does anyone know the name of the file and it's location?
You don't need to edit the actual file, you can do it through Add-Ins. You can go under settings on the Add-Ins splash screen and there is a URL cache tab where you can delete them.
It also gives you a link to open the directory with the actual file if you want to.