The file is the first volume of a split compressed archive containing the installation files for the game Dynasty Warriors 9 . Purpose of the File

An install.exe or setup.exe file used to begin the installation process. Game Features

When large software or games are distributed (often via third-party mirrors or community repositories), they are frequently split into multiple "parts" (e.g., part1.rar, part2.rar) to make them easier to download or host.

This specific file contains the initial portion of the game's data.