(findfile ".") is interesting.
This goes back to the days of DOS. Every directory (folder) contains two "files" - A single dot represents the "current" directory (folder); two dots represents the parent of the current directory (folder), i.e., the part of the path returned by single dot with the current directory chopped off. And while that is initally the "Start in" folder listed in the ACAD shortcut, some commands, such as SAVEAS, can change the current directory to whatever directory is selected for the "Save to". This can be very bothersome when some user settings are predicated on the current directory always being the Start in folder.