PST

This file format describes an "item". Items include weapons, armor, books, scrolls, rings and more. Items can have attached abilties, occuring either when a target creature it hit, or when the item is equipped. ITM files have a similar structure to SPL files.

ITM files consist of a main header, zero or more extended headers (each containing zero or more feature blocks) and zero or more casting feature blocks. All the feature blocks are stored as a continuous data segment, with each extended header containing an offset into this data, and the main header containing an offset into this data for the casting feature blocks.

Overall structure:

• Header
• Extended Headers
• Equipping Feature Blocks

Offset	Size (datatype)	Description
0x0000	4 (char array)	Signature ('ITM ')
0x0004	4 (char array)	Version ('V1.1')
0x0008	4 (strref)	Item name - generic (strref)
0x000c	4 (strref)	Item name - identified (strref)
0x0010	8 (resref)	Drop sound (played when the item is dropped in the inventory)
0x0018	4 (dword)	Flags
0x001c	2 (word)	Item type
0x001e	1*4 (char)	Usability bitmask
0x0022	2 (chars)	Weapon animation (Nameless character only) AX = Axe CL = Club DD = Dagger WH = Warhammer Blank (0x2020) = Fist
0x0024	2 (word)	Min Level
0x0026	2 (word)	Min Strength
0x0028	2 (word)	Min Strength Bonus (unused in BG1) Note: A strength of 19 or above is considred to have a Strength Bonus of 0, and would therefore not be able to equip any weapon with a Strength Bonus restriction.
0x002a	2 (word)	Min Intelligence
0x002c	2 (word)	Min Dexterity
0x002e	2 (word)	Min Wisdom
0x0030	2 (word)	Min Constitution
0x0032	2 (word)	Min Charisma
0x0034	4 (dword)	Price
0x0038	2 (word)	Stack amount
0x003a	8 (resref)	Item icon
0x0042	2 (word)	Lore to ID
0x0044	8 (resref)	Ground icon
0x004c	4 (dword)	Weight
0x0050	4 (strref)	Item description - generic (strref)
0x0054	4 (strref)	Item description - identified (strref)
0x0058	8 (resref)	Pickup sound (played when the item is picked up in the inventory)
0x0060	4 (dword)	Enchantment
0x0064	4 (dword)	Offset to extended headers
0x0068	2 (word)	Count of extended headers
0x006a	4 (dword)	Offset to feature blocks
0x006e	2 (word)	Offset to equipping feature blocks
0x0070	2 (word)	Count of equipping feature blocks
0x0072	8 (char)	Dialog
0x007a	4 (dword)	Conversable label strref
0x0076	4 (dword)	Unknown
0x007a	4 (dword)	Unknown
0x007e	2 (dword)	Paperdoll animation colour
0x0080	2 (dword)	Unknown
0x0082	4 (dword)	Unknown
0x0086	4 (dword)	Unknown
0x008a	4 (dword)	Unknown
0x008e	4 (dword)	Unknown
0x0092	4 (dword)	Unknown
0x0096	4 (dword)	Unknown

Items can have several "abilities" that correspond to an action the item can do (e.g. melee attacks, projectile attacks, spell-casting etc.). Each of these abilities is specified through an extended header. Only the first three extended headers can have charges (extended headers further than this use the charges of the first extended header). Tooltips for item abilities are set through tooltips.2da.

NB. For items to be stackable, they must contain at least one extension header, even if it is empty.
NB. For an attack type of projectile, if the projectile type is set to 1,2 or 3, the weapon will use the attack speed of the ammunition.

Offset	Size (datatype)	Description
0x0000	1 (char)	Attack type 0 = None 1 = Melee 2 = Projectile 3 = Magic 4 = Launcher
0x0001	1 (char)	ID Req. bit 0: ID Required bit 1: Non-ID Required
0x0002	1 (char)	Location 0 = None 1 = Weapon 2 = Spell 3 = Equipment 4 = Innate
0x0003	1 (char)	Unknown
0x0004	8 (resref)	Use icon
0x000c	1 (char)	Target type 0 = Invalid (cannot be selected) 1 = Creature 2 = Inventory 3 = Dead char 4 = Area 5 = Self 6 = Crash 7 = None (Self, ignores game pause)
0x000d	1 (char)	Target count
0x000e	2 (word)	Range
0x0010	2 (word)	Projectile type 0 = None 1 = Arrow 2 = Bolt 3 = Bullet
0x0012	2 (word)	Speed
0x0014	2 (word)	THAC0 bonus
0x0016	2 (word)	Dice sides
0x0018	2 (word)	Dice thrown
0x001a	2 (word)	Damage bonus
0x001c	2 (word)	Damage type 0 = None 1 = Piercing/Magic 2 = Blunt 3 = Slashing 4 = Ranged 5 = Fists
0x001e	2 (word)	Count of feature blocks
0x0020	2 (word)	Offset to feature blocks
0x0022	2 (word)	Charges
0x0024	2 (word)	Charge depletion behaviour 0 = Don't vanish 1 = Expended 2 = Expended (w/o sound) 3 = Recharge each day
0x0026	2 (word)	Flags
0x0028	2 (word)	Unknown
0x002a	2 (word)	Projectile animation (projectl.ids/missile.ids)
0x002c	2*3 (word)	Melee animation
0x0032	2 (word)	Bow/Arrow qualifier
0x0034	2 (word)	Crossbow/Bolt qualifier
0x0036	2 (word)	Misc. Projectile qualifier

Any action carried out by an item is done by feature blocks, each of which holds an effect number as well as targetting and timing information.

Offset	Size (datatype)	Description
0x0000	2 (word)	Opcode number
0x0002	1 (char)	Target 0=None 1=Self 2=Pre-Target 3=Party 4=Global 5=Non-Party 6=Non-evil 7=Unknown 8=Except Self 9=Original Caster 10=Unknown 11=Unknown 12=Unknown 13=Unknown
0x0003	1 (char)	Power
0x0004	4 (dword)	Parameter 1
0x0008	4 (dword)	Parameter 2
0x000c	1 (char)	Timing mode 0=Duration 1=Permanent 2=While equipped 3=Delayed Duration 4=Delayed 5=Delayed (transforms to 8) 6=Duration? 7=Permanent? 8=Permanent (unsaved) 9=Permanent (after Death) 10=Trigger
0x000d	1 (char)	Resistance 0=Nonmagical 1=Dispel/Not Bypass 2=Not Dispel/Not Bypass 3=Dispel/Bypass
0x000e	4 (dword)	Duration
0x0012	1 (char)	Probability 1
0x0013	1 (char)	Probability 2
0x0014	8 (resref)	Resource
0x001c	4 (dword)	Dice Thrown
0x0020	2 (word)	Dice Sides
0x0024	4 (dword)	Saving throw type bit 0: Spells bit 1: Breathe bit 2: Death bit 3: Wands bit 4: Polymorph NB. If more than 1 saving throw type is specified, the target rolls against their best save.
0x0028	4 (dword)	Saving throw bonus
0x002c	4 (dword)	Unknown