Since you are likely looking at the PC version, you can enhance your experience with community-created mods, such as the Red Hood Mod or even a mod to play as Batman.
You can play as Nightwing, Batgirl, Robin, or Red Hood in a 2-player online co-op or solo mode. Gotham Knights Build.26102022.part10.rar
This version corresponds to Build 9794860 , which was released on October 26, 2022, shortly after the game's initial launch. Since you are likely looking at the PC
If you're interested in the PC version's modding capabilities, this video demonstrates how to use mods to play as Batman, despite him not being a standard playable character: If you're interested in the PC version's modding
The .rar extension indicates a compressed archive. The .part10 suffix means this is the tenth piece of a larger file set. You will need all other parts (e.g., part01 through part10 or more) to successfully extract the contents.
This specific build was frequently discussed on community forums like Reddit's CrackWatch regarding various repacks and distribution methods shortly after the game's release. Gameplay & Character Building
While "Build" in your filename refers to a software version, players often look for to optimize heroes like Batgirl or Red Hood.