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GAM file format

Applies to:
IWD2

General Description
This file format is used to hold game information in save games. The GAM file does not store area, creature or item information, instead, it stores information on the party members and the global variables which affect party members.

Detailed Description
Overall structure:
  • Header
  • Party members
  • Party member CRE file data
  • NPCs (who are not in the party)
  • NPC kills statistics (embedded in NPC struct)
  • NPC CRE file data
  • Variables (in the GLOBAL namespace)
  • Journal entries
  • Familiar information

    • GAME V2.2 Header

    Offset Size (datatype) Description
    0x0000 4 (char array) Signature ('GAME')
    0x0004 4 (char array) Version ('V2.2')
    0x0008 4 (dword) Game time (300 units == 1 hour)
    0x000c 2 (word) Selected Formation
    0x000e 2 (word) Formation button 1
    0x0010 2 (word) Formation button 2
    0x0012 2 (word) Formation button 3
    0x0014 2 (word) Formation button 4
    0x0016 2 (word) Formation button 5
    0x0018 4 (dword) Party gold
    0x001c 2 (word) Unknown
    0x001e 2 (word) Weather bitfield
    • bit0: Rain
    • bit1: Snow
    • bit2: Light Rain
    • bit3: Medium Rain
    • bit4: Light Wind
    • bit5: Medium Wind
    • bit6: Rare Lightning
    • bit7: Lightning
    • bit8: Storm Increasing
    0x0020 4 (dword) Offset to NPC structs for party members
    0x0024 4 (dword) Count of NPC structs for party members
    0x0028 4 (dword)
    Offset to party inventory
    0x002c 4 (dword)
    Count of party inventory
    0x0030 4 (dword) Offset to NPC structs for non-party members.
    0x0034 4 (dword) Count of NPC structs for non-party members.
    0x0038 4 (dword) Offset to GLOBAL namespace variables
    0x003c 4 (dword) Count of GLOBAL namespace variables
    0x0040 8 (resref) Main area
    0x0048 4 (dword) Unknown
    0x004c 4 (dword) Count of journal entries
    0x0050 4 (dword) Offset to journal entries
    0x0054 4 (dword) Party Reputation (*10)
    0x0058 8 (resref) Current area
    0x0060 4 (dword) GUI flags
    • bit 0: (0) Party AI disabled / (1) Party AI enabled
    • bit 1: Text window size*
    • bit 2: Text window size*
    • bit 3: Unknown
    • bit 4: (0) Show GUI / (1) Hide GUI
    • bit 5: (0) Show options panel / (1) Hide options panel
    • bit 6: (0) Show portraits panel / (1) Hide portraits panel
    • bit 7: (0) Hide automap notes / (1) Show automap notes
    * These bits control the text window size. The bits relate to the size as follows:
    •   00 = Small
    •   01 = Medium
    •   10 = Unused
    •   11 = Large
    NB. Not all engines use all bits
    0x0064 4 (dword) Unknown
    0x0068 4 (dword) Offset to familiar info
    0x006c 4 (bytes) Heart of Fury mode toggle (bit 0)
    0x0070 4 (dword) Unknown
    0x0074 4 (dword) Real game time
    0x0078 4 (dword) Offset to Pocket Plane locations
    0x007c 4 (dword) Count of Pocket Plane locations
    0x0080 52 (bytes) Unused


    GAME V2.2 NPCs (both in-party and out-of-party NPCs)

    Offset Size (datatype) Description
    0x0000 2 (word) Character selection
    • 0 = Not selected
    • 1 = Selected
    • 0x8000 = Dead
    0x0002 2 (word) Party order (0x0-0x5 = PlayerXFill, 0xFFFF = not in party)
    0x0004 4 (dword) Offset (from start of file) to CRE resource data for this character
    0x0008 4 (dword) Size of CRE resource data for this character
    0x000c 8 (bytes) Character Name
    0x0014 4 (dword) Character orientation
    0x0018 8 (resref) Characters current area
    0x0020 2 (word) Character X coordinate
    0x0022 2 (word) Character Y coordinate
    0x0024 2 (word) Viewing rectangle X coordinate
    0x0026 2 (word) Viewing rectangle Y coordinate
    0x0028 2 (word) Modal action
    0x002a 2 (word) Happiness
    0x002c 4 (dword) NumTimesInteracted NPC count (unused)
    0x0030 4 (dword) NumTimesInteracted NPC count (unused)
    0x0034 4 (dword) NumTimesInteracted NPC count (unused)
    0x0038 4 (dword) NumTimesInteracted NPC count (unused)
    0x003c 4 (dword) NumTimesInteracted NPC count (unused)
    0x0040 4 (dword) NumTimesInteracted NPC count (unused)
    0x0044 4 (dword) NumTimesInteracted NPC count (unused)
    0x0048 4 (dword) NumTimesInteracted NPC count (unused)
    0x004c 4 (dword) NumTimesInteracted NPC count (unused)
    0x0050 4 (dword) NumTimesInteracted NPC count (unused)
    0x0054 4 (dword) NumTimesInteracted NPC count (unused)
    0x0058 4 (dword) NumTimesInteracted NPC count (unused)
    0x005c 4 (dword) NumTimesInteracted NPC count (unused)
    0x0060 4 (dword) NumTimesInteracted NPC count (unused)
    0x0064 4 (dword) NumTimesInteracted NPC count (unused)
    0x0068 4 (dword) NumTimesInteracted NPC count (unused)
    0x006c 4 (dword) NumTimesInteracted NPC count (unused)
    0x0070 4 (dword) NumTimesInteracted NPC count (unused)
    0x0074 4 (dword) NumTimesInteracted NPC count (unused)
    0x0078 4 (dword) NumTimesInteracted NPC count (unused)
    0x007c 4 (dword) NumTimesInteracted NPC count (unused)
    0x0080 4 (dword) NumTimesInteracted NPC count (unused)
    0x0084 4 (dword) NumTimesInteracted NPC count (unused)
    0x0088 4 (dword) NumTimesInteracted NPC count (unused)
    0x008c 2 (word) Index into slots.ids for Quick Weapon 1 (0xFFFF = none)
    0x008e 2 (word) Index into slots.ids for Quick Shield 1 (0xFFFF = none)
    0x0090 2 (word) Index into slots.ids for Quick Weapon 2 (0xFFFF = none)
    0x0092 2 (word) Index into slots.ids for Quick Shield 2 (0xFFFF = none)
    0x0094 2 (word) Index into slots.ids for Quick Weapon 3 (0xFFFF = none)
    0x0096 2 (word) Index into slots.ids for Quick Shield 3 (0xFFFF = none)
    0x0098 2 (word) Index into slots.ids for Quick Weapon 4 (0xFFFF = none)
    0x009a 2 (word) Index into slots.ids for Quick Shield 4 (0xFFFF = none)
    0x009c 2 (word) Slot usable
    0x009e 2 (word) Slot usable
    0x00a0 2 (word) Slot usable
    0x00a2 2 (word) Slot usable
    0x00a4 2 (word) Slot usable
    0x00a6 2 (word) Slot usable
    0x00a8 2 (word) Slot usable
    0x00aa 2 (word) Slot usable
    0x00ac 8 (resref) Quick Spell 1 resouce
    0x00b4 8 (resref) Quick Spell 2 resouce
    0x00bc 8 (resref) Quick Spell 3 resouce
    0x00c4 8 (resref) Quick Spell 4 resouce
    0x00cc 8 (resref) Quick Spell 5 resouce
    0x00d4 8 (resref) Quick Spell 6 resouce
    0x00dc 8 (resref) Quick Spell 7 resouce
    0x00e4 8 (resref) Quick Spell 8 resouce
    0x00ec 8 (resref) Quick Spell 9 resouce
    0x00f4 1 (byte) Quick spell 1 class
    0x00f5 1 (byte) Quick spell 2 class
    0x00f6 1 (byte) Quick spell 3 class
    0x00f7 1 (byte) Quick spell 4 class
    0x00f8 1 (byte) Quick spell 5 class
    0x00f9 1 (byte) Quick spell 6 class
    0x00fa 1 (byte) Quick spell 7 class
    0x00fb 1 (byte) Quick spell 8 class
    0x00fc 1 (byte) Quick spell 9 class
    0x00fd 1 (byte) Unknown
    0x00fe 2 (word) Index into slots.ids for Quick Item 1 (0xFFFF = none)
    0x0100 2 (word) Index into slots.ids for Quick Item 2 (0xFFFF = none)
    0x0102 2 (word) Index into slots.ids for Quick Item 3 (0xFFFF = none)
    0x0104 2 (word) Slot usable
    0x0106 2 (word) Slot usable
    0x0108 2 (word) Slot usable
    0x010a 8 (resref) Quick Innate 1
    0x0112 8 (resref) Quick Innate 2
    0x011a 8 (resref) Quick Innate 3
    0x0122 8 (resref) Quick Innate 4
    0x012a 8 (resref) Quick Innate 5
    0x0132 8 (resref) Quick Innate 6
    0x013a 8 (resref) Quick Innate 7
    0x0142 8 (resref) Quick Innate 8
    0x014a 8 (resref) Quick Innate 9
    0x0152 8 (resref) Quick Song 1
    0x015a 8 (resref) Quick Song 2
    0x0162 8 (resref) Quick Song 3
    0x016a 8 (resref) Quick Song 4
    0x0172 8 (resref) Quick Song 5
    0x017a 8 (resref) Quick Song 6
    0x0182 8 (resref) Quick Song 7
    0x018a 8 (resref) Quick Song 8
    0x0192 8 (resref) Quick Song 9
    0x019a 4 (dword) Quick Slot 1
    0x019e 4 (dword) Quick Slot 2
    0x01a2 4 (dword) Quick Slot 3
    0x01a6 4 (dword) Quick Slot 4
    0x01aa 4 (dword) Quick Slot 5
    0x01ae 4 (dword) Quick Slot 6
    0x01b2 4 (dword) Quick Slot 7
    0x01b6 4 (dword) Quick Slot 8
    0x01ba 4 (dword) Quick Slot 9
    0x01be 32 (bytes) Character Name
    0x01c2 4 (dword) Talkcount
    0x01c6 116 bytes Character Stats for this character
    0x023a 8 (resref) Soundset
    0x0242 32 (char array) Voiceset
    0x0262 4 (dword) Unknown
    0x0266 4 (dword) Unknown
    0x026a 4 (dword) Unknown
    0x026e 4 (dword) Expertise (mutually exclusive with Power Attack)
    0x0272 4 (dword) Power Attack (mutually exclusive with Expertise)
    0x0276 4 (dword) Arterial Strike (mutually exclusive with Hamstring)
    0x027a 4 (dword) Hamstring (mutually exclusive with Arterial strike)
    0x027e 4 (dword) Rapid Shot
    0x0282 4 (dword) Unknown
    0x0286 3 (bytes) Unknown
    0x0289 2 (word) Selected weapon slot
    0x0281 153 (bytes) Unknown

    GAME V2.2 Character stats

    Offset Size (data type) Description
    0x0000 4 (strref) "Most powerful vanquished" - Name
    0x0004 4 (dword) "Most powerful vanquished" - XP Reward
    0x0008 4 (dword) Time in party (1/15 seconds)
    0x000c 4 (dword) Time Joined (1/15 seconds)
    0x0010 1 (byte) Party member (0 = Not in party, 1 = In party)
    0x0011 2 (word) Unused
    0x0013 1 (byte) First letter of CRE resref (changed to *)
    0x0014 4 (dword) Kills - XP Gained (chapter)
    0x0018 4 (dword) Kills - Number (chapter)
    0x001c 4 (dword) Kills - XP (game)
    0x0020 4 (dword) Kills - number (game)
    0x0024 4*8 (resref array) Favourite spells
    0x0044 4*2 (word array) Favourite spell count
    0x004c 4*8 (resref array) Favourite weapons
    0x006c 4*2 (word) Favourite weapon time (time equipped in combat - 1/15 seconds)

    GAME V2.2 Game variables
    Note the format specification allows variables of differing types, however the engine implementation only reads and writes INT variables.

    Offset Size (data type) Description
    0x0000 32 (char array) Variable name
    0x0020 2 (type) Type
    • bit 0: int
    • bit 1: float
    • bit 2: script name
    • bit 3: resref
    • bit 4: strref
    • bit 5: dword
    0x0022 2 (word) Ref value
    0x0024 4 (dword) Dword value
    0x0028 4 (dword) Int value
    0x002c 8 (double) Double value
    0x0030 32 (char array) Script name value

    GAME V2.2 Journal entries

    This section stores the strref, chapter and time for any entry added to the journal.

    Offset Size (data type) Description
    0x0000 4 (strref) Journal text
    0x0004 4 (dword) Time (seconds)
    0x0008 1 (byte) Current chapter number
    0x0009 1 (byte) Read by character x
    0x000a 1 (byte) Journal section
    • bit 0: Quests
    • bit 1: Competed quest
    • bit 2: Journal Info
    NB. If no bits are set, the entry is a user-note
    0x000b 1 (byte) Location flag (0x1F = external TOT/TOH, 0xFF = internal TLK)

    GAME V2.2 Familiar info

    The familiar (summoned by the Find Familiar spell) is dependent on the alignment of the caster. This section contains the mapping between caster alignment and the CRE file to summon. This section is blank by default, any meaningful information entered is used by the Find Familiar opcode (0x0c0)

    Offset Size (data type) Description
    0x0000 8 (resref) Lawful Good Familiar
    0x0008 8 (resref) Lawful Neutral Familiar
    0x0010 8 (resref) Lawful Evil Familiar
    0x0018 8 (resref) Neutral Good Familiar
    0x0020 8 (resref) Neutral Familiar
    0x0028 8 (resref) Neutral Evil Familiar
    0x0030 8 (resref) Chaotic Good Familiar
    0x0038 8 (resref) Chaotic Neutral Familiar
    0x0040 8 (resref) Chaotic Evil Familiar
    0x0048 328 (bytes) Unknown