I've been using Dropbox a long time and never had this problem. When I use Spotlight in Mac OS 15.1.1 or the Finder to search, I get all kinds of results that I'm not interested in. This is a new problem for me.
ALL of the unwanted results are called "TXT.rtf"
The finder locates all of them here: Home Folder > Library > Group Containers > G7HD34EQCAK.com.getdropbox.dropbox.sync (Looks to me like it's got something to do with Dropbox.)
This is one of the areas of my computer that I don't mess with. But for some reason, Spotlight is finding them. I know you can exclude Spotlight from some things, but I don't know how to exclude a specific folder. Perhaps Dropbox is making a mistake. I don't know where to go with my problem.