VOCALOID bonus file: Thumbs.db?

Heya guys!

So, I was rummaging through the old Rin/Len pages to
see if the old demo downloads were active, which they weren't, or my
internet was just slow. XD Parts of the very last ACT1 pages are no
longer there, you can see a warning about exact times to buy them on the
day they came out, and the next archived page is just before Act.2, all
the images are removed. It's very saddening to see how it went! Still,
I'll try to get to the demos, it'd be really nice to get those VSQ and
instrumentals. If I see many interesting things rummaging through the
images in the sources I'll post about them, but all I've got is a cute
old sillouhette of Rin with shorter hair and a tiny bow. I also saw on
their early ACT2 pages with an APPEND add trying to force the phrase
Idoloid/Idloid catch. XD That'd have been cute, that's a shame!! XD It's
interesting how their descriptions would change so much, and now for
their descriptions to have a few different sentences a few days before
the announcement of V4x was such a big hype! XD

Also, another
interesting thing, Rin and Len's acts were originally written act1 act2,
not ACT1 and Act.2/act.2. That's really interesting! It cost 15 euro,
or 1680 yen to upgrade.
I did download Act.2's first
demo files' release available, and it has a few extra things, like
"thumbs.db", a database file. What does this do? I haven't seen it in
any of the downloads for the past 5 years! XD I found a few "Thumbs.db",
they were for MMD models. Why would this be in the middle? If anyone
knows, please tell me! >W< Thank you!! It was created in 2008

Also if you know how to run Unity-Chan that'd be so helpful XD