Filename

Dune saved gamed use the following naming convention:

DUNE[x][y]S[z].SAV

Where:

• x is the game major version number
• y is the game minor version number
• z is the saved game slot number

Five versions of the game exist, with a specific saved game set of files for each:

Version	Filename format
v2.1	DUNE21Sz.SAV
v2.3	DUNE23Sz.SAV
v2.4	DUNE24Sz.SAV
v3.7	DUNE37Sz.SAV
v3.8	DUNE38Sz.SAV

[!NOTE] File names is the only way to know which version of the game is running.

Dune creates five slots for the game during installation:

Filename	Type	Description
DUNExyS0.SAV	Automatic	restarts at the beginning of the game
DUNExyS1.SAV	Manual	user save slot #1
DUNExyS2.SAV	Manual	user save slot #2
DUNExyS4.SAV	Automatic	last place visited by player
DUNExyS5.SAV	Automatic	last new sietch explored by player

SAV file format

File decompression

SAV file format uses RLE compression. Compressed bytes are defined with 3 bytes:

• F7 marks the beginning
• Second byte is the number of occurences to uncompress
• Third byte is the value to recreate

Example: F7 04 C4 must be decompressed to C4C4C4C4.

Format descriptors

Header

TO BE DEFINED

Map state

TO BE DEFINED

Game state

TO BE DEFINED

Locations

70 locations (palaces, forts and sietches) are defined in the file.

Each location is a structure containing 28 bytes (once decompressed).

Name	Size	Description
Location prefix	1 byte	See table of prefixes below
Location suffix	1 byte	See table of suffixes below
Unidentified	6 bytes	Unidentified
Appearance	1 byte	Unidentified
Troop ID	1 byte	Reference to troop. See Troops below
Status	1 byte	See table of statuses
Unidentified	5 bytes	Unidentified
Spice field ID	1 byte	Unidentified
Unidentified	1 byte	Unidentified
Spice density	1 byte	0x00 to 0xFA for spice density
Unidentified	1 byte	Unidentified
Harvesters	1 byte	Number of harvesters
Ornithopters	1 byte	Number of ornithopter
Knives	1 byte	Number of knives
Guns	1 byte	Number of guns
Weirding modules	1 byte	Number of weirding modules
Atomics	1 byte	Number of atomics
Bulbs	1 byte	Number of bulbs
Water	1 byte	Water supply amount

Troops

67 troops are defined in the savegame file.

Each troop is a structure containing 27 bytes (once decompressed).

Name	Size	Description
Troop ID	1 byte	Troop unique identifier
Next Troop ID	1 byte	Refers to the next troop is several in the same sietch. Last troop has next ID = 0x00
Position	1 byte	See table of troop positions
Occupation	1 byte	See table of troop occupations
Unidentified	2 bytes	Same for each troop staying in same sietches
GPS location	4 bytes	Coordinates on the map
Unidentified	8 bytes	Related to troop activities
Dissatisfaction	1 byte	For some bytes, troop refuse to work (0xFF for example)
Speech message	1 byte	See table of troop messages
Miss You message	1 byte	Unidentified
Motivation	1 byte	0x00 to 0x64 (0x64 or above is 100% motivation)
Spice skill	1 byte	0x00 to 0x5F (0x5F is expert)
Army skill	1 byte	0x00 to 0x5F (0x5F is expert)
Ecology skill	1 byte	0x00 to 0x5F (0x5F is expert)
Equipment	1 byte	See table of equipment flags
Population	1 byte	Population value divided by 10 (0xFF = 2550 people)

NPC

TO DO

Smugglers

TO DO

Appendices

Location names

Prefixes

Value	Name
0x01	Arrakeen
0x02	Carthag
0x03	Tuono
0x04	Habbanya
0x05	Oxtyn
0x06	Tsympo
0x07	Bledan
0x08	Ergsun
0x09	Haga
0x0A	Cielago
0x0B	Sihaya
0x0C	Celimyn

Suffixes

Value	Name
0x00	No suffix
0x03	Tabr
0x04	Timin
0x05	Tuek
0x06	Harg
0x07	Clam
0x08	Tsymyn
0x09	Siet
0x0A	Pyons
0x0B	Pyort

Statuses

Flag	Description
0x00	Visible sietch/village/palace
0x01	Vegetation present (no more spice mining possible)
0x02	In battle
0x04	Unknown
0x08	Unknown
0x10	See the inventory of the sietch
0x20	Wind-trap constructed
0x40	Area of sietch has been prospected
0x80	Sietch has not been discovered

Troop positions

Value	Description
0x01	Sietch - South
0x02	Sietch - South-East
0x03	Sietch - South-West
0x04	Sietch - East
0x05	Sietch - West
0x06	Sietch - North-East
0x07	Sietch - North-West
0x08	Sietch - North
Other	Various positions around the sietch

Troop occupations

[!NOTE] Seems like like [0x00]->[0x0F] upper list jobs

Value	Description
0x00	Spice mining
0x01	Spice prospecting
0x02	Waiting orders
0x03	Spice miners going to search equipment
0x04	Military training
0x05	Espionage
0x06	Attacking
0x07	Militaries going to search equipment
0x08	Irrigation & Tree care
0x09	Wind-trap assembly
0x0A	Bulb growing
0x0B	Ecologists going to search equipment
0x0C	Blue harkonnen spice mining
0x0D	Blue harkonnen prospecting
0x0E	Blue harkonnen waiting orders
0x0F	Blue harkonnen spice miners going to search equipment
0x10 to 0x1F	Upper jobs finished
0x1F	Blue harkonnen militaries going to search equipment (CD: 150K/sec in text ^^)
0x20	Spice mining - No more orders to give
0x21	Troop prospecting captured - No more orders to give
0x22	Troop apologize for been captured
0x23	Spice miners going to search a spice harvester - No more orders to give
0x40 to 0x7F	Moving to another place
0x80 to 0x9F	Not yet hired
0xA0 to 0xFF	Complain about slaving by harkonnen

Troop messages

Flag	Description
0x01	Unknown
0x02	Gives the message that a small troop has merged with this troop
0x04	Troop is ill
0x08	Unknown
0x10	Gives the message that a fortress has been transformed into a sietch
0x20	Spice skill showing in troop characteristics
0x40	Army skill showing in troop characteristics
0x80	Ecology skill showing in troop characteristics

Troop equipment

Flag	Description
0x01	Not assigned
0x02	Bulb
0x04	Atomic weapon
0x08	Weirding modules
0x10	Laser guns
0x20	Krys knives
0x40	Ornithopter
0x80	Spice harvester