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C>S 0x4B SID_EXTRAWORK
Message Id:0x4B
Message Name:SID_EXTRAWORK
Direction:Client to Server
Used By:Starcraft Original, Starcraft Broodwar
Diablo II, Diablo II Lord of Destruction
Warcraft III Reign of Chaos, Warcraft III The Frozen Throne
Format:

(UINT16) Game type
(UINT16) Length
(STRING) Data

Remarks

Response for both S>C 0x4A SID_OPTIONALWORK and S>C 0x4C SID_REQUIREDWORK. See ExtraWork document for more details.

Game type Description
0x01 Diablo II
0x02 Warcraft III
0x03 Starcraft
0x04 World of Warcraft; reason for this is not known, but most recent libraries have included it

Length: Likely the length of the Data, in number of bytes.

Data: A string usually containing computer information.

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Comments
xboi209

Diablo 2 1.14d sends 0x04 as the game type.