While the game is distributed DRM-free by the developers, it still checks for ownership via the platform it is running on (usually Steam). Unlockers attempt to bypass these checks to enable premium features. How DLC Unlockers Work

Most unlockers for Steam-based games function by tricking the Steamworks SDK into believing the user owns specific AppIDs associated with the expansions.

A more modern tool that injects into the game on startup to modify multiple platforms beyond just Steam, including EA and Epic Games. Risks and Safety Concerns

Unlockers often do not include the actual content files (art, sounds, code). Users typically have to download these expansion files separately from external repositories and place them into the RimWorld Data or Mods folder for the unlocker to work. Common Unlocker Tools

Because RimWorld is highly mod-friendly and largely DRM-free, some users report that simply acquiring the DLC files and removing specific "Steam App ID" lines from the internal XML files within the expansion folders can sometimes bypass ownership checks.

Tools like CreamAPI or SmokeAPI replace or intercept the game's original steam_api.dll file. When the game asks Steam, "Does this user own the Biotech DLC?", the modified file returns a "Yes" regardless of actual purchase history.