As .appx files are side loaded on windows 10 insider preview but all apps are not available in .appx format so how can i install .xap file on it.
At this time you cannot. Loading .xap has been removed from builds. Project Astoria is on hold. Microsoft\’s Project Astoria and Android app emulation not happening anytime soon | Windows Central My theory, so may users rushed to load xap from any source on Insider builds that piracy caused a request to remove and Microsoft had to oblige.