The entry can be removed but I wondered whether is not caused by a pest. On the Internet, there is nothing about this format. Maybe you know something about .---Stillwater-Cottage2b?
There are many hits for Stiillwater Cottage on Google. You usually get these funny file extensions when you open a file which has no default extension, or even no extension at all. I used to have quite a few but CC 'fixed' the lot, with no deleterious effect at all.
That's possible with Windows allowing filenames like that, even more silly and a major gripe that Windows automatically adds completely useless file extensions into the registry when no application is registered to open them.