I have written a script file for a reaction rate equation. I wrote it in Wordpad, but it gets saved as a '.txt' file. How do you change this to a '.bas' file? I have used the '.txt' file with success, but REACT forgets that I used that file after saving the REACT simulation (on reopening, it reverts to the built-in rate equation). I've searched both the manuals and the user forum to no avail.