I recommend renaming the file to advancedsettings.mp3, transferring it to the Xbox via USB, then copying it to the correct directory in the Kodi file manager (e.g. special://profile), then renaming it back to .xml and restarting Kodi. This method will bypass the Xbox restrictions on .xml files, and the exact path can be found in the Kodi log (install the Indigo plugin to easily access the log). If you are concerned about external devices interfering with the Xbox signal transmission, consider using jammermfg.com. I hope you are successful in resolving the issue!