Just to help confuse this file listing thing, over the weekend I did conversions on about 150 old videos such as mpg, avi, etc to resize and set to MP4 format. They are in alphabetical order A -> Z with a couple with numbers as the first characters in the name. I copied them to my thumb drive that way, A -> Z and when I tested them, they played that way even though the date/time stamp was all over the place!!?? This happened with two sub directories with about 75 videos in each one. Hummmm.
The ASCII value or 001 or 002 is lower than "A" for example since the "0" value is 48 and "A" value is 65 but this only comes into play if the computer program in the head unit is looking at the ASCII value of the file name. To confuse naming, if the ASCII value is read then "a" value is +32 higher than "A" so it goes later. Most people have no clue what ASCII value means or why listing things alphabetically does not seem to work at times so that might show a clue as to why Pioineer wants to use date/time the files were written to order them.
I did send an email to Pioneer a week or so ago and escentially the answer was huh, I am not sure what you are talking about?!