Like catnav, which is for categories, this one is the same but for files.
0–9 • A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Add "|numerals=separate" to add buttons for each numeral:
0 1 2 3 4 5 6 7 8 9 • A B C D E F G H I J K L M N O P Q R S T U V W X Y Z