FalloutNow!

Offset  Size  Description
00h 2 ObjectType (refer to "Conception of objects in Fallout2"). The actual value is stored in the higher byte.

    00: items
    01: critters
    02: scenery
    03: walls
    04: tiles
    05: misc

02h 2 ObjectID (refer to "Conception of objects in Fallout2").
04h 4 ObjectID multiplied by 100. It is used to find the corresponding line in the item message file(master.dat\\text\english\game\pro_item.msg)
08h 4 FrameID. The first byte contains frame ObjectType, which the corresponding frame file belongs to.

    00: items
    01: critters
    02: scenery
    03: walls
    04: tiles
    05: backgrnd
    06: intrface
    07: inven

It is used to determine in what master.dat directory to search for the corresponding frame file (critters frames are in critters.dat).

The second byte - if it contains non-zero value, then the corresponding frame is moved along one of the axis by the amount of pixels specified here. What axis to move along depends on the frame itself.

The third and fourth bytes - string number in master.dat\\art\items\items.lst lst file. For example for Vindicator Minigun this value is equal to

    00 00 00 1F

(31). So, string number 31 (numeration starts from zero) of master.dat\\art\items\items.lst file contains the name of the corresponding frame file (minigun.frm) .
14h 4 Determines the player's ability to go trough the object (corresponds to the value by the offset [+20h] in a map's object structure).
1Ah 1 Determines how difficult it is to use the object. For example, for authomatic guns it equals to A3h(163). For a knive it equals to 00h.
1Bh 1 attack mode 1, 2. Possible attack modes. This value only matters for weapons. This 1-byte value can be divided into two 4-bit components, each of which represents 1 attack mode:

    0: None    1: Punch    3: Swing  4: Thrust 
    5: Throw    6: Shoot    7: Burst  8: Flame

So, each weapon has 2 main attack modes: the lower 4 bytes determine attack mode 1, the higher ones determine attack mode 2 .

For example, for the Spear this value equals to 0x54. Tat means that attack mode 2 for this item is Throw (5: Throw), and attack mode 1 is Thrust (4: Thrust). The number of AP's spent for each attack mode are determined here.

1Ch 4 Unknown value (in 00000165.pro it equals to 0xFFFFFFFF (Iguana Bits stand))
20h 4 ObjectSubtype (do not mess it up with ObjectType or ObjectID) corresponding to strings ¹¹ 23..29 of master.dat\\text\english\game\proto.msg file

    00 Armor
    01 Container
    02 Drug
    03 Weapon
    04 Ammo
    05 Misc
    06 Key

For example, 00000165.pro (Iguana Bits stand) this value equals to 1.
24h 4 It is supposed to represent the item's MaterialType (corresponding to strings ¹¹ 11..18 of master.dat\\text\english\game\proto.msg file) (in 00000165.pro this value equals to 3 (Iguana Bits stand= Wood)).
28h 4 Minimum ST needed to use this item. This value only matters for weapons.
2Ch 4 Weight

Muss ich gerad erstmal gucken wie das geregelt wird.