I've wondered about these files myself and so your question prompted
me go answer hunting.
This is the answer I found on whatis.com for the .xmp extension:
"Developed by Adobe Systems, XMP is a labeling technology that allows
organizations to embed data about files into the files themselves.
Desktop applications and back-end publishing systems thereby gain a
common method for capturing, sharing, and leveraging this valuable
metadata essentially "plowing the ground" for more efficient job
processing, workflow automation, rights management, and digital asset
repurposing."
And apparently there is a variety of software that can be used to
access and edit the file. What is to be done with it beyond that, I
don't know yet.
I'm also still looking for the answer to the .mvrt file.
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