It looks like you’re referencing a specific release for a update (v1.671.65.0) from the scene group RUNE .
The file you mentioned, Forza.Horizon.5.Update.v1.671.65.0-RUNE.part1 , refers to a specific of an update for Forza Horizon 5 Forza.Horizon.5.Update.v1.671.65.0-RUNE.part1...
The game recently added American Sign Language (ASL) and British Sign Language (BSL) support for cinematics to improve accessibility. Dynamic Environments: It looks like you’re referencing a specific release