Canada is in the folder as "Canada - Alaska". If you don't see it, then it is probably the currently open (or last opened) map file. Navigator seems to rename the map files to make them the "current" one. If you want to confirm, go into Navigator and select a different map, then look in the folder again.

p.s. It takes soooo long to download the USA maps that you might want to back them up to your computer or something before deleting them, so that you can restore them more easily in future.