About This File
ExpandAuthor: Kazowar
Thread: https://projectpokemon.org/forums/showthread.php?9873-BTX-overworld-editor
This allows you to export and import sprite sheets from the texture files in the game, most notably, overworld sprites. It's not a great program, and it bugs out and doesn't work with specific files, but it mostly works and is much less demanding than PokeTex.