Notes:
    Raw offsets in Halo 2 have no magic applied to them. However, they can reference the 
    current map file, or the three shared files. To do this, it reserves the two most significant 
    (highest) bits to define the referencing file. These are defined as: 002 being local file, 012 
    being mainmenu.map, 102 being shared.map, and 112 being single_player_shared.map.

    When referencing a raw offset, one should first determine the file being referenced, remove 
    those two bits from the offset value (and with 0x3FFFFFFF), and then seek to that offset in
    the correct file to find the referenced data. Given the size of the shared files, it is possible that
    the third most significant bit is also reserved for sharing new downloadable content in the future, 
    but this would just be speculation. - Iron Forge