Hi Victoria - I believe Microsoft Excel is able to open the databases, try right clicking and select open with - Excel, or open directly from within Excel. Bear in mind, the data in the database may not be as you expect, though it depends on the software you used. Most likely there is a column for wiki contents with each record pertaining to a different wiki page, probably formatted as wiki code or HTML. You may have many copies of the same page too, each a different 'revision' as the page was updated. It will take a long time to get at the data you want, I think. Perhaps it would be better to reinstall the software you originally used, and look for an 'export' option - it is possible it will let you output a bunch of PDF files, or HTML files, or something more humanly readable than a DB. Hope that helps.
Explode administrative templates. You should now see windows components. Explode windows components, now you will see lots of items, scroll down to File Explorer, click once on File Explorer, you should see several options in the windows on the right, 6th option down in windows 8 is Turn off the caching of thumbnails in hidden thumbs.db files.