Same problem. UFile starts IE even though Chrome is my default. I try to switch to Edge under the Settings gear in IE but still get the Oops Error.
I double checked default apps and Chrome definitely set as default. Also checked the registry and there is no setting for browser for UFile. As well I checked the UFile config files and they don't have a browser setting.
All settings seem to be coded into the UFile exe so this seems like a bug. My only thought is that my previous installations of UFile have set the browser as Internet Explorer and it carries into the latest installation.