Na tohle používám DriveSort 1.223
https://www.essential-freebies.de/board/viewtopic.php?t=14834
Setřídí názvy a uloží je do FATky. Pak to je skutečně podle abecedy.

This program enables you to reorganise the content of the directory tables on a FAT drive, in order to help portable multimedia players to play their music tracks in the right order.
It works directly on the opened disk filesystem.
Although it was made for the I-Bead player, it should work well with other portable multimedia players having a FAT12, FAT16, or FAT32 formatted disk, such as the Lynx, Muro, your mobile phone flash card, ...