Plex and .nfo files

Does anyone know how to get Plex to read .nfo files on my computer. I have several workout videos converted to .avi files and loaded them into my Plex library. When I try to scrape the info for them, none exist in the tvdb database. I was able to find .nfo files for them on the internet, but don't know how to add them. I tried searching the plex forums, but still no luck. Any ideas?