Users have to follow classical C programing rules, otherwise compilation errors may arise.
Program related to features other than humidity can be found in other files which can be accessed through that window. One underlines that you cannot open at the same time the program "user_cond.c" related to conduction and humidity models.
One reminds that a specific text editor can be chosen in the "Preferences/customize" menu (provided, of course, that the indicated text-editor be present on the Operating System).