The file in question appears to be a RAR archive file, which is a type of compressed file. The filename suggests that it contains a game, specifically "Utawarerumono: Mask of Truth", which is a visual novel and tactical role-playing game developed by Aquaplus.
The game "Utawarerumono: Mask of Truth" was developed by Aquaplus, a Japanese video game developer and publisher. If you're interested in playing the game, consider purchasing it from official channels, such as Steam, GOG, or the game's official website.
The file "Utawarerumono.Mask.of.Truth-CODEX.rar" appears to be a RAR archive containing a cracked version of the game "Utawarerumono: Mask of Truth". While I can provide information about the file, I encourage you to exercise caution and consider purchasing the game from official channels to support the developers and ensure your safety.