Electronic Arts Game MOD File
BIG is a file extension for a game data archive file format used by many Electronic Arts games. These compressed files are editable using finalbig.exe and users share game mods (or Modifications) using BIG archive files. The Electronic Arts proprietary BIG archive is similar to ELF (Extensible Linking Format).
Learn more about BIG files:
Search for answers to BIG-related questions at IT Knowledge Exchange.