thanks,you means current lazarus can not to make *.appx file?when will support?
Usually we rely on an interested user or developer to research this. There are no timetables.
and i think shop support win32/64 program is a good idea.
There seems really low interest in the store, which is probably why nobody bothered. But still it would be nice to have, in case Microsoft tries to play its hand and starts pushing for store installs (e.g. by making it the trajectory of least resistance, and requiring multiple "security" related clicks extra for normal installers)