S>C 0x3F W3GS_STARTDOWNLOAD Message Id:0x3F Message Name:W3GS_STARTDOWNLOAD Direction:Server to Client Used By:Warcraft III Reign of Chaos, Warcraft III The Frozen Throne Format:(UINT32) Unknown (UINT8) Player number Remarks This tells the client that it is now in the downloading state and should expect chunks of file data.
BNETDocs 
