.SIMS3PACK File Extension

Game package file created for The Sims 3, an open-ended life simulation game in which players manipulate a simulated environment with virtual people called "Sims;" contains visual data that represents any part of the virtual environment, such as "Sim" people, clothing, and buildings.

SIMS3PACK files may be created by anyone using a third-party Sims 3 package editor. When opened, content from a SIMS3PACK is directly imported into the game. Newly imported content is available the next time The Sims 3 is run.