The "Build" number typically identifies a specific patch or update version archived on SteamDB for version control or distribution purposes. Files distributed in .rar format outside of official storefronts like Steam are often used for:
Independent archiving of specific game states. Safety Warning Forts.Build.10215710.rar
In Forts , players design and construct custom bases in real-time, managing resources and developing tech trees to destroy their opponent's reactor core. The "Build" number typically identifies a specific patch
Another authorized retailer that tracks price history and sales. Forts Patches and Updates - SteamDB and ranked multiplayer.
The primary platform for updates, community mods, and ranked multiplayer.