By default, every Part Config in the game is written like this This makes them a pain in the ass to use. Turns out though, that you can have them on separate lines each with no harm. (imported from here) This is much nicer. I'm honestly surprised this isn't a feature by default. Posting it here cause I'm not sure where else it should go.
Interesting, I always just assumed the file was saved with Unix line endings (which notepad doesn't understand, I only ever used Ms notepad for .pc) but I've just confirmed in a more advanced text editor and a hex editor that the newlines are indeed entirely missing. Odd. Newlines are much neater.