Maybe a nit, but FWIW, on OS X you still can name your files whatever you want, 3 letter suffixes do not influence the file type, and folders still store their layout if in that mode (click the 4 squares in the toolbar and maybe you have to change one setting in the CMD J window not at a mac right now).

(not attcking you, the fact that it is a hidden setting probably proves your point. just find it interesting that this stuff is around still)