.rol files ("Role Object Binary") are scenario entity placement files used by Sega's Kenzan engine (Yakuza 3-5, Like a Dragon series). They define where interactive/reactive objects appear in the game world at runtime - things like weapons on ground, vehicles, drink tables, food stalls, and other scene props that need physics or event interaction.
They live inside stage archives under the ARCMN (Area Common) path:
ST_<CITY>.par/