I don't have shaderlist.txt file. Is there a place I can copy shaderlist.txt so I can paste the file because I don't have any idea what to write in the file unless I just copy text from Godrays.fx file?
Just create one (a blank text file), usually most easily done either by using Notepad, or by right-clicking somewhere in the Shaders folder in Windows Explorer, and selecting "create new text file" or the like... then naming it whatever you like, in either case).
All you need to type into the text file (assuming this works for you as well as me, and is indeed the solution to the right problem, so to speak) is:
Godrays.fx - nothing more, nothing less. Well, I pressed 'Enter' after that, to create a new line, but I'm not sure if that's required - unlikely, I suppose.