FS#12877 - Unsatisfactory support for LFN (Long File Name)
In FAT, file name can have max 255 characters (not bytes).
A file name that have 255 characters(contains many multibyte characters) is listed in File menu, but playback can't.
Using patched firmware\include\file.h as a test, MAX_PATH 260 up to 520, rockbox can playback the long name file.
But, changing theme causes PANIC.
This task depends upon