S>C 0x4A SID_OPTIONALWORK

Message Id:	0x4A
Message Name:	SID_OPTIONALWORK
Direction:	Server to Client
Used By:	Diablo II, Diablo II Lord of Destruction Starcraft Broodwar, Starcraft Original Warcraft III The Frozen Throne, Warcraft III Reign of Chaos
Format:	`(STRING) MPQ Filename`

Remarks

Using 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.