Drag it into a browser's open window, or set the computer's default web browser to the one you want to open it in. The Open With setting is ignored for Internet location files.
That didn't work. While waiting for someone in the Apple Support Communityto respond, I did some Internet browsing. I was told that Safari would open the file. It didn't. When I tried, the following message appeared:
404--File or Directory not found
The resource you are looking for might have been removed, had its name changed, or is temporarily unavailable.
I also read that Opera could open .webloc files, so I installed it. The result was the same.