Hi britrecko ,
You won't be able to open the Cache.database file as it is meant only for Lightroom to read.Could you still tell us the exact path of this cache file/folder?
i do not have the skills to answer your request.
All i can do is repeat that this is a recent phenomena.
I have not changed any prefences.
I have counted the number of new cache files on my desktop and they correspond to the number of imsages that i have deleted in my lightroom.