pasting... that is what I was missing. oh my, I feel even more illiterate now.
thank you!
LOL - no, you asked, got a reply, then it's the opposite: you're LESS
illiterate!
Missed the bsx part: .bsx is the extension of the files created natively by BrickStore.
In short, it's a BrickStore file, inside it's an XML file which starts
to be accepted in places like BrickLink (for a wanted-list) or rebrickable (as
a inventory download), etc.
It's also how you should save locally on your PC/Cloud your Shop inventory
(to be safe), and everything you upload or change (to keep track of) - in case
one day you've a discrepency or think there's an error somewhere, you
can check your historic files and get clues...