Weird!.I have no idea why its there ,it is not needed?
Its not in my master file ,but it is in the downloaded.rar from the site.
...
Sometimes with .rar's thumbs are made for some reason which i do not know ,i have noticed it in some older sprite packs of others ,but i have always never added them and everything always worked.
Perhaps i had renamed and old folder?
Thanks for spotting that as the pack was incorrectly built.
I found an answer to what "thumbs.db" is. German language:
http://computer.meinwissen.info/thumbsdb-was-sie-ist-und-wofuer-man-sie-braucht/
My rough translation: Thumbs.db is a file which contains information regarding the miniatureview of thumbnails, mostly found in folders containing pictures. Even if you delete it, it will be re-created by Explorer once you open that folder again so that you will see the miniatureview faster than when it has to be created from the pic every time. Can only be permanently get rid of if you change the settings of your Explorer accodring to the article.