PST

These files contain a description of the types of items and services available for sale in a given store, inn, tavern, or temple.

Overall structure

Offset	Size (data type)	Description
0x0000	4 (char array)	Signature ('STOR')
0x0004	4 (char array)	Version ('V1.1')
0x0008	4 (dword)	Type (0=Store, 1=Tavern, 2=Inn, 3=Temple)
0x000c	4 (strref)	Name
0x0010	4 (dword)	Flags: bit 0: User allowed to buy bit 1: User allowed to sell bit 2: User allowed to identify items bit 3: User allowed to steal bit 4: User allowed to donate money bit 5: User allowed to purchase cures bit 6: User allowed to purchase drinks bit 7: Unknown bit 8: Unknown bit 9: Unknown bit 10: Unknown (Recharge items?) bit 11: Unknown bit 12: Buy Fenced Goods
0x0014	4 (dword)	Store "sell price markup" (percentage of base price store charges for items)
0x0018	4 (dword)	Store "buy price markup" (percentage of base price store is willing to pay)
0x001c	4 (dword)	Depreciation rate
0x0020	2 (word)	% chance of steal failure
0x0022	2 (word)	Capacity
0x0024	8 (bytes)	Unknown
0x002c	4 (dword)	Offset to items purchased section
0x0030	4 (dword)	Count of items in items purchased section
0x0034	4 (dword)	Offset to items for sale section
0x0038	4 (dword)	Count of items for sale
0x003c	4 (dword)	Lore
0x0040	4 (dword)	ID Price
0x0044	8 (resref)	Rumours (Tavern)
0x004c	4 (dword)	Offset to drinks section
0x0050	4 (dword)	Count of drinks
0x0054	8 (resref)	Rumours (Temple)
0x005c	4 (dword)	Room flags bit 0: Peasant bit 1: Merchant bit 2: Noble bit 3: Royal
0x0060	4 (dword)	Price of a peasant room
0x0064	4 (dword)	Price of a merchant room
0x0068	4 (dword)	Price of a noble room
0x006c	4 (dword)	Price of a royal room
0x0070	4 (dword)	Offset to cures section
0x0074	4 (dword)	Count of cures
0x0078	36 (bytes)	Unknown

Offset	Size (data type)	Description
0x0000	8 (resref)	Filename of ITM
0x0008	2 (word)	Item expiration time (replace with drained item)
0x000a	2 (word)	Quantity/Charges 1
0x000c	2 (word)	Quantity/Charges 2
0x000e	2 (word)	Quantity/Charges 3
0x0010	4 (dword)	Flags bit 0: Identified bit 1: Unstealable bit 2: Stolen bit 3: Undroppable
0x0014	4 (dword)	Amount of this item in stock
0x0018	4 (dword)	Infinite supply flag (0=limited stock, 1=infinite stock)
0x001c	4 (dword)	Strref for trigger
0x0020	56 (char array)	Unknown

Offset	Size (data type)	Description
0x0000	8 (resref)	Rumour resource
0x0008	4 (strref)	Drink name strref
0x000c	4 (dword)	Drink price
0x0010	4 (dword)	Alcoholic strength

Offset	Size (data type)	Description
0x0000	8 (resref)	Filename of SPL
0x0008	4 (dword)	SPL price

This is an array of dwords. These dwords indicate item categories the store is willing to purchase. The category code can also be found inside the ITM file for an itm.
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These codes are used in store files to indicate which types of items they will buy. They are also be used to determine which inventory slots the item is allowed to go into on the inventory screen and the sound the item makes when moved in the inventory.

Code	Item type
0x0000	Books/misc
0x0001	Amulets and necklaces
0x0002	Armor
0x0003	Belts and girdles
0x0004	Boots
0x0005	Arrows
0x0006	Bracers and gauntlets
0x0007	Helms, hats, and other head-wear
0x0008	Keys (not in Icewind Dale?)
0x0009	Potions
0x000a	Rings
0x000b	Scrolls
0x000c	Shields (not in IWD)
0x000d	Food
0x000e	Bullets (for a sling)
0x000f	Bows
0x0010	Daggers
0x0011	Maces (in BG, this includes clubs)
0x0012	Slings
0x0013	Short swords
0x0014	Long swords (in BG, this includes 2-handed and bastard swords)
0x0015	Hammers
0x0016	Morning stars
0x0017	Flails
0x0018	Darts
0x0019	Axes (specifically, 1-handed axes -- halberds and 2-handed polearms not included)
0x001a	Quarterstaff
0x001b	Crossbow
0x001c	Hand-to-hand weapons (fist, fist irons, punch daggers, etc)
0x001d	Spears
0x001e	Halberds (2-handed polearms)
0x001f	Crossbow bolts
0x0020	Cloaks and robes
0x0021	Gold pieces (not an inventory item, but can appear as "monster dropped" treasure)
0x0022	Gems
0x0023	Wands
0x0024	Bag/eye/broken armor
0x0025	Broken shield/bracelet
0x0026	Broken sword/earring
0x0027	Tattoos (PST)
0x0028	Lenses(PST)
0x0029	Buckler/teeth
0x002a	Candle
0x002b	Unknown
0x002c	Clubs(IWD)
0x002d	Unknown
0x002e	Unknown
0x002f	Large Shield(IWD)
0x0030	Unknown
0x0031	Medium Shield(IWD)
0x0032	Notes
0x0033	Unknown
0x0034	Unknown
0x0035	Small Shield(IWD)
0x0036	Unknown
0x0037	Telescope(IWD)
0x0038	Drink(IWD)
0x0039	Great Sword(IWD)
0x003a	Container
0x003b	Fur/pelt
0x003c	Leather Armor
0x003d	Studded Leather Armor
0x003e	Chain Mail
0x003f	Splint Mail
0x0040	Half Plate
0x0041	Full Plate
0x0042	Hide Armor
0x0043	Robe
0x0044	Unknown
0x0045	Bastard Sword
0x0046	Scarf
0x0047	Food(IWD2)
0x0048	Hat
0x0049	Gauntlet