GCD files contain starting character profiles. For more details, see "Resource Handling", section "Premade characters".
In addition to the 'theme' characters combat.gcd, stealth.gcd and diplomat.gcd, there are thee other files: demo.gcd, blank.gcd and player.gcd.
Demo.gcd was used in the demo, and blank.gcd and player.gcd were intended for creating our own characters (recall at the beginning of the game choosing the button "create character"). However, none of these files are used in the game.
GCD File Format
All offsets are listed in this table:
| Offset | Meaning | Normal Range |
|---|---|---|
| Game flags | ||
| 0x0000 | This part is not fully understood, but includes indicating some of the status tags shown in the lower-left part of the screen. It's known that 0x00000001 - "sneak", 0x00000008 - "level", 0x00000010 - "addict". The tags for "poisoned" and "radiated" are not here. | - |
| Primary stats | ||
| 0x0004 | Strength (ST) | 0 to 10 |
| 0x0008 | Perception (PE) | 0 to 10 |
| 0x000C | Endurance (EN) | 0 to 10 |
| 0x0010 | Charisma (CH) | 0 to 10 |
| 0x0014 | Intelligence(IN) | 0 to 10 |
| 0x0018 | Agility (AG) | 0 to 10 |
| 0x001C | Luck (LK) | 0 to 10 |
| Secondary stats | ||
| 0x0020 | Hit Points * | 0 to 999 |
| 0x0024 | Action Points * | 0 to 999 |
| 0x0028 | Armor Class * | 0 to 999 |
| 0x002C | Unarmed Damage (NOTE: this is not used by the game! Melee Damage stat is used instead.) | - |
| 0x0030 | Melee Damage * | 0 to 999 |
| 0x0034 | Carry Weight * | 0 to 999 |
| 0x0038 | Sequence * | 0 to 99 |
| 0x003C | Healing Rate * | 0 to 99 |
| 0x0040 | Critical Chance * | 0 to 100 |
| 0x0044 | Critical hit modifier * | 0 to 100 |
| 0x0048 | Damage Threshold - normal | 0 to 999 |
| 0x004C | Damage Threshold - laser | 0 to 999 |
| 0x0050 | Damage Threshold - fire | 0 to 999 |
| 0x0054 | Damage Threshold - plasma | 0 to 999 |
| 0x0058 | Damage Threshold - electrical | 0 to 999 |
| 0x005C | Damage Threshold - EMP | 0 to 999 |
| 0x0060 | Damage Threshold - explosive | 0 to 999 |
| 0x0064 | Damage Resistance - normal | 0 to 100 |
| 0x0068 | Damage Resistance - laser | 0 to 100 |
| 0x006C | Damage Resistance - fire | 0 to 100 |
| 0x0070 | Damage Resistance - plasma | 0 to 100 |
| 0x0074 | Damage Resistance - electrical | 0 to 100 |
| 0x0078 | Damage Resistance - EMP | 0 to 100 |
| 0x007C | Damage Resistance - explosive | 0 to 100 |
| 0x0080 | Radiation Resistance * | 0 to 100 |
| 0x0084 | Poison Resistance * | 0 to 100 |
| 0x0088 | Age | 0 to 35 |
| 0x008C | Gender | 1 - female, 0 - male. |
| Bonuses to primary stats | ||
| 0x0090 | Bonus to strength | 0 to 10 |
| 0x0094 | Bonus to perception | 0 to 10 |
| 0x0098 | Bonus to endurance | 0 to 10 |
| 0x009C | Bonus to charisma | 0 to 10 |
| 0x00A0 | Bonus to intelligence | 0 to 10 |
| 0x00A4 | Bonus to agility | 0 to 10 |
| 0x00A8 | Bonus to luck | 0 to 10 |
| Bonuses to secondary stats | ||
| 0x00AC | Bonus HP | 0 to 999 |
| 0x00B0 | Bonus AP | 0 to 999 |
| 0x00B4 | Bonus AC | 0 to 999 |
| 0x00B8 | Bonus to unarmed damage (NOTE: this is not used by the game! Melee Damage stat is used instead.) | - |
| 0x00BC | Bonus to melee damage | 0 to 999 |
| 0x00C0 | Bonus to carry weight | 0 to 999 |
| 0x00C4 | Bonus to sequence | 0 to 99 |
| 0x00C8 | Bonus to healing rate | 0 to 99 |
| 0x00CC | Bonus to critical chance | 0 to 100 |
| 0x00D0 | Bonus to critical hit modifier | 0 to 100 |
| 0x00D4 | Bonus to DT (normal) | 0 to 999 |
| 0x00D8 | Bonus to DT (laser) | 0 to 999 |
| 0x00DC | Bonus to DT (fire) | 0 to 999 |
| 0x00E0 | Bonus to DT (plasma) | 0 to 999 |
| 0x00E4 | Bonus to DT (electrical) | 0 to 999 |
| 0x00E8 | Bonus to DT (EMP) | 0 to 999 |
| 0x00EC | Bonus to DT (explosive) | 0 to 999 |
| 0x00F0 | Bonus to DR (normal) | 0 to 100 |
| 0x00F4 | Bonus to DR (laser) | 0 to 100 |
| 0x00F8 | Bonus to DR (fire) | 0 to 100 |
| 0x00FC | Bonus to DR (plasma) | 0 to 100 |
| 0x0100 | Bonus to DR (electrical) | 0 to 100 |
| 0x0104 | Bonus to DR (EMP) | 0 to 100 |
| 0x0108 | Bonus to DR (explosive) | 0 to 100 |
| 0x010C | Bonus to radiation resistance | 0 to 100 |
| 0x0110 | Bonus to poison resistance | 0 to 100 |
| 0x0114 | Bonus to age | 0 to 35 |
| 0x0118 | Bonus to gender (sex-change surgery is still available in the post-nuclear world, it seems) | Positive values - female, negative or zero - male |
| Skills | ||
| 0x011C | Small Guns | 0 to 300-(5+4*AG) |
| 0x0120 | Big Guns | 0 to 300-(2*AG) |
| 0x0124 | Energy Weapons | 0 to 300-(2*AG) |
| 0x0128 | Unarmed | 0 to 300-(30+2*(ST+AG)) |
| 0x012C | Melee Weapons | 0 to 300-(20+2*(ST+AG)) |
| 0x0130 | Throwing | 0 to 300-(4*AG) |
| 0x0134 | First Aid | 0 to 300-(2*(PE+IN)) |
| 0x0138 | Doctor | 0 to 300-(5+PE+IN) |
| 0x013C | Sneak | 0 to 300-(5+3*AG) |
| 0x0140 | Lockpick | 0 to 300-(10+PE+AG) |
| 0x0144 | Steal | 0 to 300-(3*AG) |
| 0x0148 | Traps | 0 to 300-(10+PE+AG) |
| 0x014C | Science | 0 to 300-(4*IN) |
| 0x0150 | Repair | 0 to 300-(3*IN) |
| 0x0154 | Speech | 0 to 300-(5*CH) |
| 0x0158 | Barter | 0 to 300-(4*CH) |
| 0x015C | Gambling | 0 to 300-(5*LK) |
| 0x0160 | Outdoorsman | 0 to 300-(2*(EN+IN)) |
| Unknown | ||
| 0x0164-0x016F | Unknown. These values are always zero. | - |
| Other | ||
| 0x0170-0x018F | Character name | 0 to 32 characters, padded with zeroes |
| 0x0190 | First tagged skill | 0 to 17 |
| 0x0194 | Second tagged skill | 0 to 17 |
| 0x0198 | Third tagged skill | 0 to 17 |
| 0x019C | Fourth tagged skill (This stays default value unless GCD was edited manually outside of the game.) | 0 to 17, default is FF FF FF FF |
| 0x01A0 | First trait | 0 to 15 |
| 0x01A4 | Second trait | 0 to 15 |
| 0x01A8 | Character points (for stats) | 0 to 70-(ST+PE+EN+CH+IN+AG+LK) |
Notes:
1. All offsets point to "big endian" DWORDs (4-byte numbers, lowest value = 4th byte).
2. Some values can be set higher than the maximum (SPECIAL, for example), but starting a game with them won't work. (not sure if this means an error/crash, or not having further effect beyond the max.)
3. Not all the maximum values have been verified; some are based on (fairly reasonable) assumptions.
4. When setting maximum values, remember that traits can affect stats and skills, and primary stats affect skills and secondary stats.
5. Those marked "presumably" are based on comparison with the SAVE.DAT file format (and also from studying PRO files).
6. Asterisks (*) mark secondary stats which are calculated based on primary stats and are not loaded from the GCD. I.e. they are here only nominally, and are not actually used.
7. If you tagged a fourth skill, the number of additional tag skill points becomes 99 (the default is 3, as you may recall). However, it's not possible to tag all the skills, because the restriction to three tagged skills remains.
If you play on a Mac, you can use the grammar on synalysis.net to edit .gcd files easily.
Original document at teamx.ru (in russian)
