MISDATA.DAT

This 170 byte file (172 for TFTD) is only used by tactical saves. It comes in three flavours:

• MISSION.DAT
  

Initially created by the GeoScape engine and stored in the MISSDAT folder. Contains info required for Battlescape Map Generation.

• MISDATA.DAT
  

Created along with a battlescape save, effectively a mirror of the original "MISSION.DAT".

• MISSION2.DAT
  

Appears in the MISSDAT folder at the end of combat. Contains debreifing data (such as who won, what was recovered and what points were scored). The relevant offsets for this file are unused by the previous two versions.

Values are presented according to byte offset (0 to 169/171) followed by the equivalent hex offset (00 to A9/AA) in bold. Let us know what else you can find!!

Structure

Offset (Decimal)	Offset (Hex)	Usage
The first 20 bytes are a count up of the various recoverable tile types in the map. These two-byte integers are only set if you actually won the mission by eliminating all enemy forces. These offsets + 100 index into the respective BASE.DAT values that they'll be added to. See Equipment Recovery for more information.
0-1	0x00-0x01	UFO Power Source (MCD[59] set to 02).
2-3	0x02-0x03	UFO Navigation (MCD[59] set to 03, not counted for alien bases).
4-5	0x04-0x05	UFO Construction (MCD[59] set to 04, no known tiles have this set).
6-7	0x06-0x07	Alien Food (MCD[59] set to 05).
8-9	0x08-0x09	Alien Reproduction (MCD[59] set to 06, no known tiles have this set).
10-11	0x0A-0x0B	Alien Entertainment (MCD[59] set to 07).
12-13	0x0C-0x0D	Alien Surgery (MCD[59] set to 08).
14-15	0x0E-0x0F	Examination Room (MCD[59] set to 09).
16-17	0x10-0x11	Alien Alloys (MCD[59] set to 10). The total is divided by 2 for a UFO mission or 30 for an alien base. The value stored here is further divided by 5 to get the result you see on the debriefing screen.
18-19	0x12-0x13	Alien Habitat (MCD[59] set to 11, no known tiles have this set).
20-21	0x14-0x15	Mission descriptor. Possible values: UFO TFTD 0: UFO Site 0: USO Site 1: Terror Site 1: Port/Island Attack 2: Base Defense (X-COM Base) 2: Base Defense (X-COM Base) 3: Base Offense (Alien Base) 3: Colony Stage 1 4: Mars Stage 1 4: T'leth Stage 1 5: Mars Stage 2 5: T'leth Stage 2 6: T'leth Stage 3 7: Artefact Site Stage 1 8: Artefact Site Stage 2 9: Passenger/Cargo Ship Stage 1 10: Passenger/Cargo Ship Stage 2 11: Colony Stage 2
Values 22-73 (Hex: 16-49) primarily hold scoring information. As per the tile recovery indexes, these are only stored in the final "end-of-combat" MISSION2.DAT. For temporary storage mid-mission, some of these values are stored in WGLOB.DAT.
22-23	0x16-0x17	Aliens killed.
24-25	0x18-0x19	Aliens killed score.
26-27	0x1A-0x1B	Alien corpses.
28-29	0x1C-0x1D	Corpse score.
30-31	0x1E-0x1F	Live aliens captured.
32-33	0x20-0x21	Live alien score.
34-35	0x22-0x23	Artefacts (unresearched alien items) recovered.
36-37	0x24-0x25	Artefacts score.
38-39	0x26-0x27	Alien base control destroyed. This flags if you win a base offense mission by killing all enemy forces, or if you destroy all 16 nav modules in the command center. If not zero, the base you were attacking will be removed from the world map at the end of combat.
40-41	0x28-0x29	Base control score.
42-43	0x2A-0x2B	Civilians killed by aliens.
44-45	0x2C-0x2D	Civilians killed by aliens score (typically negative).
46-47	0x2E-0x2F	Civilians killed by X-COM.
48-49	0x30-0x31	Civilians killed by X-COM score (typically negative).
50-51	0x32-0x33	Civilians saved.
52-53	0x34-0x35	Civilians saved score.
54-55	0x36-0x37	X-COM troopers killed.
56-57	0x38-0x39	X-COM troopers killed score (typically negative).
58-59	0x3A-0x3B	X-COM troopers "retired through injury" (never actually flags).
60-61	0x3C-0x3D	X-COM troopers "retired through injury" score (never actually flags).
62-63	0x3E-0x3F	X-COM troopers MIA.
64-65	0x40-0x41	X-COM troopers MIA score (typically negative).
66-67	0x42-0x43	Tanks lost.
68-69	0x44-0x45	Tanks lost score (typically negative).
70-71	0x46-0x47	X-COM craft lost (GeoScape ignores this if you actually lose a craft, Tactical sets it regardless).
72-73	0x48-0x49	X-COM craft lost score (GeoScape ignores this if you actually lose a craft, Tactical doesn't set it regardless).
74-75	0x4A-0x4B	A value based on the time at the LOC.DAT location. References into a table stored in the executable in order to define the values in BGLOB.DAT.
76	0x4C	For a UFO site, this is the LOC.DAT reference corresponding to the crash site. This is plausibly true for every mission type (with the possible exception of the Mars assault). Used to determine whether the alien ship crashed or not (and therefore whether to randomly detonate the power supply units). I seem to remember that tweaking this byte could have an effect on BGLOB.DAT, but I might've confused myself. - Bomb Bloke 03:45, 23 June 2008 (PDT)
77	0x4D	Index into CRAFT.DAT pointing to the craft sent on this mission. In the case of base defense (see offset [79]), it indexes into BASE.DAT.
78	0x4E	Victory status. 0: Mission aborted. 1: Mission won. 2: Mission lost. 3: Mission completely lost through abortion (no units in exit areas).
79	0x4F	0 unless the mission is a UFO site, in which case it is 1. Determines use of [77] but doesn't seem to affect [16-17].
80-151	0x50-0x97	A list of 36 two-byte integers, used during base defense missions. In order, they represent each module in your base, reading from left to right, top to bottom. At the end of battle, the tactical game engine tallies up the amount of "target" objects existing within each module, and stores the results in "MISSION2.DAT". If that figure is 0 for any given destructible facility, then the geoscape engine will remove it from your base (along with any other modules that relied on that section for passage to the Access Lift). "Target objects" are tiles that have offset 60 set to 1 within their MCD record.
Bytes 152-167 (Hex: 0x98-0xA7) allow you to use the following equipment only if they are set to 1. X-COM produced equipment can be used even if it hasn't been researched (however, in order to get it into combat, you must build it - and that requires research). The last three entries in the list are item slots that were never used in the game.
152	0x98	Enables Heavy Plasma (ObData[34])
153	0x99	Enables Heavy Plasma Clip (ObData[35])
154	0x9A	Enables Plasma Rifle (ObData[36])
155	0x9B	Enables Plasma Rifle Clip (ObData[37])
156	0x9C	Enables Plasma Pistol (ObData[38])
157	0x9D	Enables Plasma Pistol Clip (ObData[39])
158	0x9E	Enables Blaster Launcher (ObData[40])
159	0x9F	Enables Blaster Bomb (ObData[41])
160	0xA0	Enables Small Launcher (ObData[42])
161	0xA1	Enables Stun Bomb (ObData[43])
162	0xA2	Enables Alien Grenade (ObData[44])
163	0xA3	Enables Elerium-115 (ObData[45])
164	0xA4	Enables Mind Probe (ObData[46])
165	0xA5	Enables "null>>UNDEFINED <<" (ObData[47])
166	0xA6	Enables "null>> empty <<" (ObData[48])
167	0xA7	Enables "null>> empty <<" (ObData[49])
168-169	0xA8-0xA9	Determines the language in which the mission was initiated. If the game is saved and later loaded, this overrides whatever language was selected when the program started. 0 - English 1 - German 2 - French
170	0xAA	Only present for TFTD. Determines the depth level (that is, which battlescape palette to use, whether to render air bubbles around units, and which background noise to play): 0 - Surface 1 - Shallow Water 2 - Medium Depths 3 - Deep Sea
171	0xAB	Only present for TFTD. Unknown, never seen it flag. Could be part of the above value.

See Also

• Battlescape Map Generation
• Saved Game Files
• OBDATA.DAT
• MCD files
• WGLOB.DAT
• CRAFT.DAT
• BASE.DAT