This structure is 96 bytes size.

4 bytes are reserved for enabling Quests and Waypoints of each act
2 bytes are reserved for each Quest
Some bytes are not used

If you want to consult the Quests Offsets, that's here

Structure detail :

• Act 1 (total of 16 bytes)
  • Enable A (2 bytes)
  • Enable B (2 bytes)
  • Quest 1 : Den of Evil
  • Quest 2 : Sister's Burial Ground
  • Quest 5 : Tools of the Trade
  • Quest 3 : The Search for Cain
  • Quest 4 : The Forgotten Tower
  • Quest 6 : Sister to the Slaughter
  
  
• Act 2 (total of 16 bytes)
  • Enable A (2 bytes)
  • Enable B (2 bytes)
  • Quest 1 : Radament's Lair
  • Quest 2 : The Horadric Staff
  • Quest 3 : Tainted Sun
  • Quest 4 : Arcane Sanctuary
  • Quest 5 : The Summoner
  • Quest 6 : The Seven Tombs
  
  
• Act 3 (total of 16 bytes)
  • Enable A (2 bytes)
  • Enable B (2 bytes)
  • Quest 1 : Lam Esen's Tomb
  • Quest 2 : Blade of the Old Religion
  • Quest 3 : Khalim's Will
  • Quest 4 : The Golden Bird
  • Quest 5 : The Blackened Temple
  • Quest 6 : The Guardian
  
  
• Act 4 (total of 10 bytes)
  • Enable A (2 bytes)
  • Enable B (2 bytes)
  • Quest 1 : The Fallen Angel
  • Quest 3 : Terror's End
  • Quest 2 : Hell's Forge
  
  
• Act 5 (total of 26 bytes)
  • Enable A (2 bytes)
  • Reserved (6 bytes)
  • Enable B (2 bytes)
  • Reserved (4 bytes)
  • Quest 1 :
  • Quest 2 :
  • Quest 3 :
  • Quest 4 :
  • Quest 5 :
  • Quest 6 :
  
  
• Reserved Datas (10 bytes)

Enabling Quest and Waypoints is done with this values :

• Act 1 in Normal difficulty (the very first Quest data encountered) :
        Enable A = 2A 01
        Enable B = 01 00
  
  
• Other Quest and / or other difficulty :
        Enable A = 01 00
        Enable B = 01 00
  

Definition of the bits
As said before, each Quest value is 2 bytes. They are bitfields.

In the 1st byte :

• Bit 0: Quest completed 1 (single player)
• Bit 1: Reward available
• Bit 2: Quest started
• Bit 3: Stage 4 complete
• Bit 4: Stage 1 complete
• Bit 5: Stage 2 complete
• Bit 6: Stage 3 complete
• Bit 7:

• Bit 0:
• Bit 1:
• Bit 2: Stage 5 complete
• Bit 3: Stage 6 complete
• Bit 4: Quest completed 2 (single player) (Quest has already vanished in fire in Quest window)
• Bit 5:
• Bit 6:
• Bit 7: Quest completed (multi player) (Quest will be vanished in fire in Quest window)

To indicate that a Quest is complete and the reward has been collected,
set the value for the Quest to 7D 1C.

To indicate that a Quest is complete and the reward hasn't been collected,
set the value for the Quest to 7F 1C.

Secret cow level (info in Act I Quest 3. Not verified, take this "as is")

	Normal	Nightmare	Hell
Offset Enable Disable Killed Cow King	0094h 90 0E 98 0D 9C 0D	00F4h 10 0D ? ?	0154h ? ? ?

Imbue
Act I Quest 5 involves a smithing hammer, and as a result you get to Imbue one item. Setting Bit 1 of the 1st byte for Act I Quest 5 (at any difficulty level) enables you to Imbue one item.

If you want to consult the Quests Offsets, that's here
Back to Part 1