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S>C 0x4A SID_OPTIONALWORK
Message Id:0x4A
Message Name:SID_OPTIONALWORK
Direction:Server to Client
Used By:Starcraft Original, Starcraft Broodwar
Diablo II, Diablo II Lord of Destruction
Warcraft III Reign of Chaos, Warcraft III The Frozen Throne
Format:

(STRING) ExtraWork MPQ Filename

Remarks

Battle.net requests optional work from the Client using this message. See ExtraWork document for more details.

Using C>S 0x33 SID_GETFILETIME with request ID 0x80000005, the client should download this file and call the ExtraWork function inside of it. Generally, this message is used for the optional ExtraWork DLL.

The client will only execute this entirely if the registry key HKCU\Software\Battle.net\Optimize\SysDesc [REG_UINT32] is set to 1.

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