You cannot convert an ISO into one XBE file. That is like trying to convert a whole library of books into a single page. Instead, what people actually need is an ISO extractor that creates a folder of files where the default.xbe resides alongside assets.
. This utility allows you to pull the internal file structure out of an ISO image so you can access the default.xbe file required for emulators like Cxbx-Reloaded or for transferring to a modded console. Top Recommended Tools iso to xbe file converter