These functions allow the saving and loading of REXPaint files.
Keep in mind that REXPaint files are typically encoded as Code Page 437 which will need to be converted into Unicode to be understood by libtcod.
tcod::load_xp
tcod::save_xp
TCOD_load_xp
TCOD_save_xp
TCOD_load_xp_from_memory
TCOD_save_xp_to_memory