SRL File Format

In Pokémon Mystery Dungeon: Explorers of Sky, this file format contains a ROM image of the DS Download Play demo that can be shared with others via the main menu.

Explorers of Sky is the only out of the 3 "Explorers of" games to have those in its "/SYSTEM/" directory. One can simply rename the file, changing its extension to ".nds" and load the file into any NDS emulators as if it was a regular ROM image!