This is a compression format. Because update files can be large, they are often packed into a .rar archive to make downloading and transferring the data faster and more efficient.

Since its release, Astral Chain has received several software updates (commonly referred to as "ver. 1.0.1," "ver. 1.0.2," etc.) and post-launch content like cosmetic DLC and File 12, a challenging post-game mission set.