From the help file :
To capture commands for the current environment

From the Tools menu, choose Options.
Press Shift and select OK to display the environment SET commands in the Command window.
From the Command window, copy and paste into your program.

Is there a way to programmatically capture all of this environment information into a text file (then I could rename it a .prg file)?

I use the Codemine framework for some of my projects and it has a function in it that programmatically sets every single environment variable. It does so with many explicit SET commands.

I am lazy and do not want to rework this extensive and detailed Codemine class library to work on my non-Codemine projects.