I am trying to modify an existing custom ArcMap toolbox (change input parameters, doc, etc.) but I just can't do anything with the .tbx file.
I see Python code in there but it seem to be a binary file. The "edit" "Refresh" and "Check syntax" menu items on right click are greyed out.
All I can do is edit the script tool itself (it pops up the script in notepad)
So how do you modify the .tbx?