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PRO File Format

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Note: All file paths (folders) are relative to either master.dat (or critter.dat) if packed, or to Fallout's/Fallout 2's DATA folder if unpacked.

This document describes the format of Fallout and Fallout 2 .PRO (Prototype) files, which are located in PROTO/.

Each item, critter, wall, tile, and piece of scenery in the game has its own corresponding PRO file. The PRO file name is usually generated using the object's ObjectID, pre-padded by zeros so that it's 8 digits. For example, ObjectID of 32 would become 00000032.PRO.

The .PRO files in saved games (in DATA/SAVEGAME/SLOT##/PROTO/) have, like the .SAV files, been gzipped. Adding the extension '.gz' will let most archive utilities open them. Once extracted, they have the format described here.


Format descriptionEdit

All controlling values in an PRO file are stored in big-endian format. The first 56 bytes are common for all PROs. Those bytes are followed by values specific for each type (and subtype, for Items and Scenery).


PRO typesEdit

Type ID Object Location in PROTO/ File size, in bytes
0x00 Items ITEMS/ 129, 125, 122, 81, 69, 65, or 61, depending on type
0x01 Critters CRITTERS/ 416 in Fallout 2, 412 in Fallout 1
0x02 Scenery SCENERY 49 or 45, depending on type
0x03 Walls WALLS/ 36
0x04 Tiles TILES/ 28
0x05 Misc MISC/ 28

Common headerEdit

Offset Size Description
0x0000 4 ObjectType & ObjectID

Format:[1]

0xAABBCCCC
  | | |
  | | |
  | | +- ObjectID
  | +--- Possible part of object ID (see footnote)
  +----- ObjectType

ObjectType:

00: items
01: critters
02: scenery
03: walls
04: tiles
05: misc
0x0004 4 TextID

Normally ObjectID multiplied by 100. This is the line number of the object name & description (TextID+1) in the appropriate message file (directory text/english/game/, file pro_item.msg, pro_crit.msg, pro_scen.msg, pro_wall.msg, pro_tile.msg, or pro_misc.msg).

0x0008 4 FrmType & FrmID

Format:[1]

0xAABBCCCC
  | | |
  | | |
  | | +- FrmID
  | +--- Possible part of FrmID (see footnote)
  +----- FrmType

FrmType:

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

It is used to determine in what directory to search for the corresponding FRM list and file (critter FRM list and files are in critter.dat).


FrmID: line number in the relevant .lst file (e.g. art/items/items.lst for Items).

0x000C 4 Light radius

Values: 0..8 (hexes)

0x0010 4 Light intensity

Values: 0..65536 (0x0000FFFF). According to Fallout 2 mapper, this value is interpreted as 0..100%.

0x0014 4 Flags [2] [3] [4]
0x00000008 - Flat (rendered first, just after tiles)
0x00000010 - NoBlock (doesn't block the tile)
0x00000800 - MultiHex 
0x00001000 - No Highlight (doesn't highlight the border; used for containers) 
0x00004000 - TransRed 
0x00008000 - TransNone (opaque) 
0x00010000 - TransWall 
0x00020000 - TransGlass
0x00040000 - TransSteam 
0x00080000 - TransEnergy
0x10000000 - WallTransEnd (changes transparency egg logic. Set for walls with 1144 - 1155 pid)
0x20000000 - LightThru 
0x80000000 - ShootThru

ItemsEdit

Item types:

Type ID Object File size, in bytes
0 Armor 129
1 Container 65
2 Drug 125
3 Weapon 122
4 Ammo 81
5 Misc Item 69
6 Key 61

Common fieldsEdit

Offset Size Description
0x0018 3 Flags Ext

Item Flags:

0x080000 - Hidden Item


Action Flags:

0x000008 - Use (can be used) 
0x000010 - Use On Smth (can be used on anything) 
0x000080 - PickUp


Weapon Flags:

0x000001 - Big Gun 
0x000002 - 2Hnd (weapon is two-handed)
0x001B 1 Attack Modes:

This value is only used for weapons. This 1-byte value can be divided into two 4-bit components, each of which represents an attack mode:

0 - None
1 - Punch
2 - Kick
3 - Swing
4 - Thrust  
5 - Throw
6 - Fire Single
7 - Fire 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.

0x001C 4 Script ID (script)

Format: 0x0Y00XXXX Y-type specifier (1-spatial, 2-items, 3 - scenery, 4-critters) XXXX-line in scripts.lst If the value is 0xFFFFFFFF, there is no script

0x0020 4 ObjSubType

(see proto.msg, starting with the line 150) Values:

0 - Armor
1 - Container
2 - Drug
3 - Weapon
4 - Ammo
5 - Misc
6 - Key
0x0024 4 MaterialID
0x0028 4 Size (volume in containers)
0x002C 4 Weight
0x0030 4 Cost
0x0034 4 Inv FID (FRM ID for the item in inventory)
0x0038 1 Sound ID

Sound related to the item: when picked up from the ground, opening a container, etc. Values:

0x21 
0x23 
0x24 
0x30 ... 0x5A

ArmorEdit

Offset Size Description
0x0039 4 AC
Damage Resistance
0x003D 4 DR Normal
0x0041 4 DR Laser
0x0045 4 DR Fire
0x0049 4 DR Plasma
0x004D 4 DR Electrical
0x0051 4 DR EMP
0x0055 4 DR Explosion
Damage Threshold
0x0059 4 DT Normal
0x005D 4 DT Laser
0x0061 4 DT Fire
0x0065 4 DT Plasma
0x0069 4 DT Electrical
0x006D 4 DT EMP
0x0071 4 DT Explosion
Other
0x0075 4 Perk

(see perk.msg, starting with the line 101) -1 means no perk. Note: the object may have any perk, but not all will work.

0x0079 4 Male FID
0x007D 4 Female FID

ContainersEdit

Offset Size Description
0x0039 4 Max Size (how much it can contain)
0x003D 4 Open Flags:

0x00000001 - Cannot Pick Up (implies Magic Hands Grnd!)

0x00000008 - Magic Hands Grnd (reach down to open/close)

DrugsEdit

Offset Size Description
0x0039 4 Stat0

Determines what character's characteristic is to be changed immediately after taking the drug. Values: (see stat.msg, starting with the line 100)

0 - Strength 
1 - Perception 
2 - Endurance


etc.

-1 - no effect 
-2 - Amount1 (below) will contain a random number between Amount0, and Amount1 (inclusive)
0x003D 4 Stat1

See Stat0

0x0041 4 Stat2

See Stat0

Instant effect
0x0045 4 Amount0

Modifier for Stat0

0x0049 4 Amount1

Modifier for Stat1

0x004D 4 Amount2

Modifier for Stat2

First delayed effect
0x0051 4 Duration1

The time delay for the first effect (in game minutes).

0x0055 4 Amount0

Modifier for Stat0

0x0059 4 Amount1

Modifier for Stat1

0x005D 4 Amount2

Modifier for Stat2

Second delayed effect
0x0061 4 Duration2

The time delay for the second effect. This should be more Duration1.

0x0065 4 Amount0

Modifier for Stat0

0x0069 4 Amount1

Modifier for Stat1

0x0065 4 Amount2

Modifier for Stat2

Other
0x0071 4 Addiction Rate

The probability of getting addicted, in percent.

0x0075 4 Addiction Effect

Number of the perk to be given when the player is addicted. Values: (see perk.msg, starting with the line 101) -1 for no perk Note: any perk can be used, but not all will work.

0x0079 4 Addiction Onset

Delay before the addiction effect is applied.

WeaponsEdit

Offset Size Description
0x0039 4 Anim Code

Which frameset is used for characters wielding that weapon. Values:

0x00 - None (A)
0x01 - Knife (D) 
0x02 - Club (E) 
0x03 - Sledgehammer (F) 
0x04 - Spear (G) 
0x05 - Pistol (H) 
0x06 - SMG (I) 
0x07 - Rifle (J) 
0x08 - Big Gun (K) 
0x09 - Minigun (L) 
0x0A - Rocket Launcher (M)
0x003D 4 Min Dmg
0x0041 4 Max Dmg
0x0045 4 Dmg Type

(see proto.msg, starting with the line 250)

0 - Normal 
1 - Laser 
2 - Fire 
3 - Plasma 
4 - Electrical 
5 - EMP 
6 - Explosive
0x0049 4 Max Range 1

The maximum distance for Primary Attack

0x004D 4 Max Range 2

The maximum distance for Secondary Attack

0x0051 4 Proj PID

Format: 0x0500YYYY


where YYYY is an index in misc.lst

0x0055 4 Min ST

The minimum strength required to use the weapon

0x0059 4 AP Cost 1

The number of AP for Primary Attack

0x005D 4 MP Cost 2

The number of AP for Secondary Attack

0x0061 4 Crit Fail

Number of the list of critical failures possible for this weapon.

0x0065 4 Perk

Number of the perk associated with this weapon.


Values: see perk.msg, starting with the line 101; -1 for no perk


Note: the weapons can be have any perk, but not all will work.

0x0069 4 Rounds

The number of rounds fired in a burst attack.

0x006D 4 Caliber

Values: see proto.msg, starting with the line 300

0x0071 4 Ammo PID

Index in items.lst

0x0075 4 Max Ammo (size of the magazine)
0x0079 1 Sound ID

Sound effects for the weapon: shooting, reloading, etc. Line number in master.dat/sound/sfx/sndlist.lst

AmmoEdit

Offset Size Description
0x0039 4 Caliber (ammo type)

Values: see proto.msg, starting with the line 300

0x003D 4 Quantity

The number of rounds in a magazine

0x0041 4 AC modifier
0x0045 4 DR modifier
0x0049 4 Dam Mult

The multiplier part of the ammo damage mod.

0x004D 4 Dam Div

The divisor part of the ammo damage mod.

MiscEdit

Offset Size Description
0x0039 4 Power PID

Index in items.lst

0x003D 4 Power Type

Values: see proto.msg, starting with the line 300

0x0041 4 Charges

The maximum number of charges

KeysEdit

Offset Size Description
0x0039 4 KeyCode

always 0xFFFFFFFF

CrittersEdit

Offset Size Description
0x0018 4 Flags Ext

Action Flags:

0x00002000
0x00004000
0x001C 4 Script ID

Format: 0x0Y00XXXX

Y-type specifier (1-spatial, 2-items, 3 - scenery, 4-critters)

XXXX-room in scripts.lst

If the value is 0xFFFFFFFF, there is no script

0x0020 4 Head FID (for talking heads)

(see <FRM- File Format identifier for Fallout1 & 2>)

0x0024 4 AI Packet

Format: 0x00000XXX XXX-see ai.txt, parameter packet_num Note: Some numbers can be drawn from packages and aibdymsg.txt aigenmsg.txt. Similarly ai.txt.

0x0028 4 Team Num
0x002C 4 Flags

Critter Flags:

0x00000002 - Barter (can trade with)
0x00000020 - Steal (cannot steal from)
0x00000040 - Drop (doesn't drop items) 
0x00000080 - Limbs (can not lose limbs) 
0x00000100 - Ages (dead body does not disappear) 
0x00000200 - Heal (damage is not cured with time) 
0x00000400 - Invulnerable (cannot be hurt) 
0x00000800 - Flatten (leaves no dead body) 
0x00001000 - Special (there is a special type of death) 
0x00002000 - Range (melee attack is possible at a distance) 
0x00004000 - Knock (cannot be knocked down)
Base values of primary stats
0x0030 4 Strength (1-10)
0x0034 4 Perception (1-10)
0x0038 4 Endurance (1-10)
0x003C 4 Charisma (1-10)
0x0040 4 Intelligence (1-10)
0x0044 4 Agility (1-10)
0x0048 4 Luck (1-10)
0x004C 4 HP
0x0050 4 AP
0x0054 4 AC
0x0058 4 Unarmed damage (UNUSED, use Melee damage instead)
0x005C 4 Melee damage
0x0060 4 Carry weight (0-999)
0x0064 4 Sequence
0x0068 4 Healing rate
0x006C 4 Critical chance
0x0070 4 Better criticals
Base values of DR and DT
0x0074 4 DT Normal
0x0078 4 DT Laser
0x007C 4 DT Fire
0x0080 4 DT Plasma
0x0084 4 DT Electrical
0x0088 4 DT EMP
0x008C 4 DT Explosive
0x0090 4 DR Normal
0x0094 4 DR Laser
0x0098 4 DR Fire
0x009C 4 DR Plasma
0x00A0 4 DR Electrical
0x00A4 4 DR EMP
0x00A8 4 DR Explosive
0x00AC 4 DR Radiation
0x00B0 4 DR Poison
Basic age and sex
0x00B4 4 Age (1-99)
0x00B8 4 Gender (0-male, 1-female)
Bonuses to primary stats
0x00BC 4 Strength (1-10)
0x00C0 4 Perception (1-10)
0x00C4 4 Endurance (1-10)
0x00C8 4 Charisma (1-10)
0x00CC 4 Intelligence (1-10)
0x00D0 4 Agility (1-10)
0x00D4 4 Luck (1-10)
0x00D8 4 HP
0x00DC 4 AP
0x00E0 4 AC
0x00E4 4 Unarmed damage (UNUSED, use Melee damage instead)
0x00E8 4 Melee damage
0x00EC 4 Carry weight (0-999)
0x00F0 4 Sequence
0x00F4 4 Healing rate
0x00F8 4 Critical chance
0x00FC 4 Better criticals
Bonuses to DT and DR
0x0100 4 DT Normal
0x0104 4 DT Laser
0x0108 4 DT Fire
0x010C 4 DT Plasma
0x0110 4 DT Electrical
0x0114 4 DT EMP
0x0118 4 DT Explosive
0x011C 4 DR Normal
0x0120 4 DR Laser
0x0124 4 DR Fire
0x0128 4 DR Plasma
0x012C 4 DR Electrical
0x0130 4 DR EMP
0x0134 4 DR Explosive
0x0138 4 DR Radiation
0x013C 4 DR Poison
Bonuses to age and sex
0x0140 4 Age (1-99)
0x0144 4 Gender (0-male, 1-female)
Skills
0x0148 4 Small guns (0-300)
0x014C 4 Big guns (0-300)
0x0150 4 Energy weapons (0-300)
0x0154 4 Unarmed (0-300)
0x0158 4 Melee (0-300)
0x015C 4 Throwing (0-300)
0x0160 4 First aid (0-300)
0x0164 4 Doctor (0-300)
0x0168 4 Sneak (0-300)
0x016C 4 Lockpick (0-300)
0x0170 4 Steal (0-300)
0x0174 4 Traps (0-300)
0x0178 4 Science (0-300)
0x017C 4 Repair (0-300)
0x0180 4 Speech (0-300)
0x0184 4 Barter (0-300)
0x0188 4 Gambling (0-300)
0x018C 4 Outdoorsman (0-300)
Other
0x0190 4 Body Type

(see proto.msg, starting with the line 400)

0x0 - biped 
0x1 - quadruped 
0x2 - robotic
0x0194 4 Exp Val

Amount of experience gained for killing this critter

0x0198 4 Kill Type

(see proto.msg, starting with the line 1450)

0x00 - Men 
0x01 - Women 
0x02 - Children 
0x03 - Super Mutants 
0x04 - Ghouls 
0x05 - Brahmin 
0x06 - Radscorpions 
0x07 - Rats 
0x08 - Floaters 
0x09 - Centaurs 
0x0A - Robots 
0x0B - Dogs 
0x0C - Manti 
0x0D - DeathClaws 
0x0E - Plants  (only applies to Fallout 2)
0x0F - Geckos  (only applies to Fallout 2)
0x10 - Aliens  (only applies to Fallout 2)
0x11 - Giant Ants  (only applies to Fallout 2)
0x12 - Big Bad Boss (only applies to Fallout 2)
0x019C 4 Damage Type

(see proto.msg, starting with the line 250)

0x0 - Normal 
0x1 - Laser 
0x2 - Fire 
0x3 - Plasma 
0x4 - Electrical 
0x5 - EMP 
0x6 - Explode

SceneryEdit

Types of scenery:

Scenery ID Type .pro file size, in bytes
0 Door 49
1 Stairs 49
2 Elevator 49
3 Ladder Bottom 45
4 Ladder Top 45
5 Generic Scenery 45

Common FieldsEdit

Offset Size Description
0x0018 2 Wall Light Type Flags
0x001A 2 Action Flags
0x001C 4 ScriptType & ScriptID
0x0020 4 ScenerySubType

[5] Values:

0: Door 
1: Stairs 
2: Elevator 
3: Ladder Bottom 
4: Ladder Top 
5: Generic Scenery
0x0024 4 MaterialID
0x0028 1 SoundID

Values (according to the list in Fallout 2 mapper):

 0x21 
 0x23 
 0x24 
 0x30..0x5A

DoorEdit

Offset Size Description
0x0029 4 WalkThru Flag

Values:

0x0000000F: yes
0x002D 4 (unknown)

0xCCCCCCCC (mostly) or 0xFFFFFFFF (sometimes)

Stairs[6] Edit

Offset Size Description
0x0029 4 DestTile & DestElev
0x002D 4 DestMap

Value is a map number in data\maps.txt (hard-coded list in Fallout?), -1 goes to the worldmap.

Elevator[6] Edit

Offset Size Description
0x0029 4 ElevType

Values from 0x00 to 0x17

0x002D 4 ElevLevel

Current level of the elevator (not to be confused with the level of map!). This parameter specifies which floor the arrow initially points at.

Ladder Bottom[6] Edit

Offset Size Description
0x0029 4 DestTile & DestElev

Ladder Top[6] Edit

Offset Size Description
0x0029 4 DestTile & DestElev

Generic SceneryEdit

Offset Size Description
0x0029 4 (Unkown)

0xCCCCCCCC (mostly) or 0xFFFFFFFF (sometimes)

WallsEdit

Offset Size Description
0x0018 2 Wall Light Type Flags
0x001A 2 Action Flags
0x001C 4 ScriptType & ScriptID
0x0020 4 MaterialID

TilesEdit

Offset Size Description
0x0018 4 MaterialID

MiscEdit

Offset Size Description
0x0018 4 Unknown, presumably unused

Repeated valuesEdit

These are values that appear in more than one PRO type/subtype.

LengthDescription
2 Wall Light Type Flags
0x0000 - North / South 
0x0800 - East / West 
0x1000 - North Corner 
0x2000 - South Corner 
0x4000 - East Corner 
0x8000 - West Corner
2 Action Flags
0x0001 - Kneel down when using
0x0008 - Use (can be used) 
0x0010 - Use On Smth (can be used on anything) 
0x0020 - Look
0x0040 - Talk 
0x0080 - PickUp
4 DestTile & DestElev

Format:[1]

0xABCCDDDD
  | | |
  | | |
  | | +- DestTile
  | +--- Possible part of DestElev (see footnote)
  +----- DestElev

DestElev: A can be anything[7], B values:

0x0: zero 
0x2: first 
0x4: second

DestTile values: 0 to 40000.

4 ScriptType & ScriptID

-1 (0xFFFFFFFF) for none.


Format:[1]

0xAABBCCCC
  | | |
  | | |
  | | +- ScriptID
  | +--- Possible part of ScriptID (see footnote)
  +----- ScriptType

ScriptType:[8]

03: Holodisk

ScriptID: Number of the line in scripts/scripts.lst that has the filename of the required script.

4 MaterialID

[9] Values:

0: Glass 
1: Metal 
2: Plastic 
3: Wood 
4: Dirt 
5: Stone 
6: Cement 
7: Leather

Footnotes & referencesEdit

  1. 1.0 1.1 1.2 1.3 It is currently unknown how the second byte is (or isn't) used. It is possible, and even likely, that instead of reading the value as two separate numbers (ignoring the second byte), all 4 bytes are actually read as a single number, of which the first byte is then split away. That would leave 3 bytes for ObjectID (instead of 2), allowing ObjectIDs up to 2^24 (16777215 or 8388607) instead of just 2^16 (65535 or 32767).
  2. Even though the data is present in the file, the flags are not used for Tiles — the value is always -1 (0xFFFFFFFF).
  3. TransNone, TransWall, TransGlass, TransSteam and TransEnergy flags are mutually exclusive, but TransNone is not default value, default is empty. If any of Trans* flags are set, than the object is not affected by transparency egg
  4. There is information that there is another flag, "0x00000020 - Lights (gives off light, see fields Light radius and Light intensity)". Considered false until proven otherwise, since doesn't show up anywhere in Fallout 2 mapper (instead, the Light Radius, Light Intensity and/or Wall Light Type Flags seem to be used to determine wether the proto gives off light at all)
  5. See text/game/proto.msg, starting with the line 200.
  6. 6.0 6.1 6.2 6.3 These values are not normally saved in the .pro file (space filled with 0xFF), as they only make sense when actually put on a map.
  7. Setting DestElev in Fallout 2 mapper autmatically sets A to 0xC.
  8. Older information suggests "1-spatial, 2-items, 3-scenery, 4-critters", but since 3 is actualy "Holodisk", at least in items, it is not trusted.
  9. See proto.msg, starting with the line 100.

Credits for the original (pre-wiki) articleEdit

Originally written by Borg Locutus

Re-written and extended by Serge, R&D Group Leader, TeamX

Additional info by Tarantul.

Some info borrowed from FIME item editor manual by Garry

Revised by DIMS.

Translated by Dr. W95

Most content comes from the TeamX document

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