.GID and .FTS files are auxiliary files created by the Windows Help
system when performing certain kinds of searches in Windows
.HLP files. .GID and .FTS files can always be deleted. Windows
will simply make new ones when it needs them; it will simply add a
few seconds and an "OK" click next time you use notetab.hlp.
Tidy is a tool recommended by Eric for cleaning up HTML files in
NoteTab. It can also be used, more or less, as an HTML validator.
I use it, but it's a matter of taste. Even if you don't use it though,
don't just destroy it. Keep a copy somewhere. Later versions may
stop being free, and you'll regret having thrown yours away. I've
had this happen to me with several good freeware utilities.