Does This Hack Work With Mac TextEdit?

Hey Folks, I came across a post that gives instructions on how to change the Kindle's default font sizes -- link here: https://www.mobileread.com/forums/sh...2&postcount=19 -- when I tried it using my Mac's built in text editor, TextEdit, it did not work. Is there some other software that might make it work?

I did all of the steps in the post: I opened TextEdit, typed in 14 numbers with a space in between each number(7.5 8 8.5 9 9.5 ... etc), saved the file and named it "FONT_RAMP", and then copied over to the root of my Kindle drive. The software on my Kindle Voyage is up to date.