Aww, that's so cool. The episode select screen doesn't work when I swap out the .exe files, but I can get into levels using save files. Nice to see my own blocksets in reduced color mode. I even found a bug -- if you type APOGEE again, it reverts back to normal; if you cycle to the next level with APOGEE still turned on, the color count is restored but palette swapping remains disabled.

edit: What's weird is that in my 1.3, I think JAZZ.EXE is just a wrapper for FILE0001.EXE. I wonder how that change came about.