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The WDB files are found inside the WDB folder. The client caches data it receives from the server. This is mainly done to reduce network traffic.


  • WDB files < 1.6: Header length is 16 bytes
  • WDB files >=1.6: Header length is 20 bytes (Verified till 1.9.4)
  • WDB files >=3.0.8-9506: Header length is 24 bytes
Offset 	Type 		Description
0x00 	char[4] 	Identifier, depends on the WDB file, will be explained later
0x04 	uint32 		Client Version - Version of the client (lo -> hi encoding)
0x08 	char[4] 	Client Local - The Locale of the client
0x0C 	 ???? 		4 bytes unknown
0x10 	 ???? 		4 bytes unknown
0x15 	 ???? 		4 bytes unknown (Beginning with version 1.6 and later)
0x18 	 ???? 		4 bytes unknown (Beginning with version 3.0.8-9506 )
Column	Field 		Type 		Notes 
1 	Signature 	String 		4-byte string identifying the file (reversed!) 
2 	Version 	Integer 	4-byte integer identifying the client version 
3 	Language 	String 		4-byte string identifying the language (reversed!) 
4 	Row Length 	Integer 	Something to do with row length, there is no consistent way of retrieving it as of yet. 
5 	Unknown 	Integer 	4-bytes
6 	Unknown2 	Integer 	4-bytes

WDB files

File 			Signature 
CreatureCache.wdb 	WMOB 
GameObjectCache.wdb	WGOB 
QuestCache.wdb 		WQST 
ItemCache.wdb 		WIDB       (No longer used in cata)
ItemNameCache.wdb 	WNDB       (No longer used in cata)
ItemTextCache.wdb 	WITX 
NPCCache.wdb 		WNPC 
PageTextCache.wdb 	WPTX 
WOWCache.wdb 		WRDN