If it doesn't work, then 'gexp' is probably not on the %PATH%
echo %PATH%
... so find 'gexp' location, and CD there first.
Similiar to this:
C:
cd C:\ProgramData\chocolatey\lib\geth-stable\tools
geth account new
(This example is from my geth (go-ethereum) installation, and 'geth' lives in "C:\ProgramData\chocolatey\lib\geth-stable\tools")
EDIT: Just looked into Expanse - you already have exactly that already :-)
--> "Setup_Step_2_new_account.bat" - but see my suggestion below.
It will take me some time to get used to Ethereum/Expanse's commands but I'll get there. It's a totally new world in crypto.

The command line has millions of advantages.
One hint, to make it all "clickable" again ...
When you notice that you type the same command line command over and over again
... just make a .bat file (.bat = a 'batch' file of commands that shall be executed).
In my above example, if creating a new account were the thing that you want to do,
just create (with text editor, e.g. notepad, or better
notepad++) a file with this content:
gexp account new
pause
and save it as
gexp_account_new.bat
and ... double-click it.
Great! Thanks for this useful advice. Creating bat files with the commands listed above makes my life easier by not having to type the same command over and over again. I'm going to keep studying Ethereum/Expanse's commands until I really get the hang of it. In the meantime, I'll just create bat files for automation.
