Generic "Game" or "Media" RAR files are common vectors for trojans or adware.
Often used for indie or adult-oriented visual novels distributed on platforms like itch.io, Patreon, or community forums. Dawn_of_Grace.part1.rar
Because this is .part1 , it contains the file header and the beginning of the data. You cannot open or "fix" this file individually without the other parts. Generic "Game" or "Media" RAR files are common