Bug! Url adds _root in IE
When adding a Url command action to a button that calls a webresource page it adds _root to the Url in IE. It doesn't do this in Edge, Firefox, or Chrome but I have some users who still use IE and we can't get around it.
I wanted to use the modal capabilities but currently I have to use the Xrm.Utility.openWebresource method which opens a new window instead of a modal. If anyone has a workaround I would love to know.