Header: Size=114 Bytes

Ext. Header: Size= 40 Bytes

Feature Block: Size=48 Bytes

Header:

Every Item File Contains A Header. It Contains The Basic Properties Of The Item Represented By The File.
 

Extended Header:

If An Item Affects Other Creatures, Like A Weapon Or A Wand, The Item File Contains An Extended Header:
One ExtendedHeader Equals One Ability Of An Item.
 

Feature Block:

Items With Magical Capabilities Contain One Or More Feature Blocks. Every Feature Block Represents One Special Ability Of An Item.
 
 

Header:

FileType:
 

This Field Contains The Type Of The Data File. It Should Be The Same As The File Extension.
 

FileRevision:
 

Revision Of The Data File. In BG I've Only Found 'V1.x' Files, But This May Change With Future Expansions.
 

ItemNameReference(UnIdentified):
 

This Is The Reference To The Name Of The (Unidentified) Item. The Reference Is The Index Of The Name String Contained In Dialog.tlk.
 

ItemNameReference(Identified):
 

This Is The Reference To The Name Of The (Identified) Item. The Reference Is The Index Of The Name String Contained In Dialog.tlk.
 

UsedUpItemFile:
 

This Field Contains The FileName Of An ItemFile. If The Item Gets Destroyed (Used Up), It Will Get Replaced By The Item Specified In This Field.
 

ItemAttributes:
 

This Field Is Some Kind Of Boolean Array:
 

Bit 0 is the LSB, Bit 7 the MSB
 

ItemType:
 

It Can Contain The Following Values:
 

Useability:
 

The Useability Field Is 4 Bytes Long And It's A Boolean Field, But I Don't Know How To Name It In Detail. Every Bit Stands For A Character Attribute. If The Bit Is Set, None Of The Characters With This Attribute Can Use The Item.

I Split The Field Up Into 4 Bytes. They Are In The Same Order As In The File.
 

ItemAnimation:
 

This field specifies the item animation and the item appearance on the paperdoll:
 

ItemPrice:
 

Contains The ItemPrice In Gold Pieces. A Price Of One GP Has To Be Writen As A 0. If It Would Be Written As A 1 Then It Might Get Rounded Down To Zero After The Multiplication With The Reputation Factor.
 

ItemStack:
 

Contains The Number Of Items Of A Kind That Are Allowed To Be Stacked By The Player In One Inventory Field. Any Number Greater Than 0 Will Display The StackedItemsCountNumber In The Game. The System May Stack More Items Than The ItemStack Field Allows. For Example To Avoid The Display Of The StackedItemsCountNumber On Wands (Charges Of A Wand = Stacked Wands)
 

InventoryIcon:
 

FileName Of The BAMFile That Contains The Inventory Icon.
 

LoreToIdentify:
 

Lore Needet To Identify This Item.
 

GroundIcon:
 

FileName Of The BAMFile That Contains The Image Of The Item Lieing On The Ground.
 

ItemWeight:
 

Weight Of The Item.
 

DescriptionReference(UnIdentified):
 

This Is The Reference To The Description (Right Click In Inventory) Of The Unidentified Item. The Reference Is The Index Of The Description String Contained In Dialog.tlk.
 

DescriptionReference(Identified):
 

This Is The Reference To The Description (Right Click In Inventory) Of The Identified Item. The Reference Is The Index Of The Description String Contained In Dialog.tlk.
 

DescriptionIcon:
 

FileName Of The BAMFile That Contains The Description Icon (image on the description screen).
 

ExtendedHeaderOffset:
 

Offset Of The Extended Header Found In Weapons And Such Stuff.
 

ExtendedHeaderCount:
 

Some Item Files May Actually Contain More Than One Extended Header..
 

FeatureTableOffset:
 

Offset Of The Feature Table. If No Features Available It Points To The End Of The File.
 

FeatureBlockCount:

This Field Contains The Number Of Feature Blocks That Affect The User Of This Item.
 
 

Extended Header:

This field determines the type af the ability contained in the ExtendedHeader:
 

Target:
 

Specifies the target of this Extended Header
 

ProjectileType:
 

If the item is a projectile, this field specifies it's type:
 

DamageType:
 

This field specifies the type of the damage done:
 

EffectAnimation:
 

EffectAnimation is the animation that will start when the item's ability is used:
 

Feature Block:

Feature:
 

TargetIdentifier:
 

TaregetIdentifier deetermines the target of this effect
 

Parameter 1:
 

Parameter 1 Is A Parameter Passed To The Feature/Effect Function. Most Time It Contains The Modification Value Of A Feature/Effect.
 

Parameter 2:
 

Parameter 2 Is The Second Parameter Passed To The Feature/Effect Function. Most Time It Contains The Mode Of Parameter 1(%, Absolute, Relative.....).
 

EffectTimeMode:
 

This field sets the timemode of the item and the EffectTimeField
 

EffectTime:
 

EffectTime Contains A Time Value For The Effect.

Game Time In Rounds = EffectTime / 60
 

Probability:
 

This Field Contains The Probability This Effect To Happen. It's Value Can Go From 0 To 100.(0 The Effect Never Happens, 100 The Effect Happens Allways) The Values Grater Than 100 Are Taken As 100.
 

FileName:
 

FileName Is Another Paremeter Passed To The Effect/Feature Function. Some Functions Like Make Sound Use It To Specify The Sound File Played.
 

Throws:
 

This Field Only Matters For Dice Based Effects.
 

DiceSides:
 

This Field Only Matters For Dice Based Effects.
 

SavingThrowType:
 

This field determines the type of saving throw that must be made to avoid Effect.
 

SavingThrowBonus:
 

This field determines the bonus to the saving throw that must be made to avoid Effect.