The internet is your friend, well not really but try these:
https://virtualpinball.com/pages/how-to-add-new-pinball-fx2-games-to-pinballx
https://www.youtube.com/watch?v=vHKU5MIDpPo
https://www.youtube.com/watch?v=DcgrHwwluzY
http://www.vpforums.org/index.php?showtopic=31994
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