Joined: Aug 2010
Posts: 12,727
Likes: 2,105
From: Madison, WI
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
BBB gave you a very large file with the name gmapsupp.img which is your map. (I think I spelled it correctly, but I am not using the computer right now that I use for GPS stuff, could be wrong.) It might have given you some other tiny little files, if so those are not important to have.
The last time I got a BBB download, I changed the file name to 2025 05 Minn Wisc Ill bike.img (date and area of coverage, the word bike to differentiate it from auto or topo map). You can change it to anything that computers allow for a file name, I avoid punctuation for that reason. But I like to have the date of download, area of coverage, and type of map in my file name.