: Build 41.78 is often considered a "golden version" for modding, similar to specific versions of Minecraft, because of the sheer volume of high-quality mods built for it before the transition to Build 42.

Build 41.78.13 was a minor update focused on quality-of-life (QoL) improvements and technical bug fixes. It was released to the stable branch on . Key Changes in this Build:

: Added the AllowCoop server option to explicitly allow or disallow splitscreen clients.

Addressed an exploit where sleeping pills weren't correctly accounted for when trying to sleep while panicked.

: Resolved issues where distant remote players weren't appearing on the in-game map and fixed errors with the /additem server console command. Important Context: Security and Legacy Status

: Developers later discovered security vulnerabilities in Build 41 that could allow malicious mods to execute arbitrary code. This led to the removal of many older Build 41 versions from Steam's beta branches.