That .mht suggests something didn't go quite right with the download, however the contents is correct. To be sure it works, I wouldn't rename it, but do the following:
In the folder, right click, select New, select Text document. This creates a new file in the folder, named New Text Document.txt. Double-click that file so it opens in Notepad. The file should be empty.
Also open the .mht file so you get that on screen as well. Use your mouse to select everything or press ctrl-A, which should highlight all the text. Once it is highlighed, press ctrl-C, then go to your notepad window and press ctrl-V. This should copy and paste all that text into the new file you created above. Close all windows, when it asks you whether you want to save the contents of the New Text Document.txt press Yes.
Now rename the New Text Document.txt to resource.cfg. It will probably warn you that changing the extension may make it unusable, do it regardless. :-)
Once all that is done, take a look whether you see that "Mod scripts found" window when you start the game. :-)