File, Save saves a copy of your mod

File, Save saves a copy of your model in the directory you designate as a file with the
extension .ahp
File, Save As is used to save your model under a new name. The old file is closed and
you continue working in the new file. It is useful to save successive versions such as
car1.ahp, car2.ahp, car3.ahp and so on about every 30 minutes so you always have a
recent copy you can restore in case of an unforeseen problem.
File, Advanced Save can be used to compress models to a smaller size file with the
extension .mod.gz. Such models can be opened in the usual way with the File, Open
command, but it may take a little longer.
File, Configure, General tab Go to the General tab in the configure dialogue box to set
the automatic saving interval for models. The un-do command is currently disabled