Pokémon Mystery Dungeon: Red Rescue Team:pksdir0
"pksdir0" is a 7-characters string with a null ending character, present several hundreds of times in the ROM, with different amount for different region localization.
Its use is unknown, but it is probably just a development leftover with no use whatsoever. It can probably be modified or removed without consequences to game functionality.
It is not present in Blue Rescue Team.