Usage: ftinitdownload clientftfid={clientFileTransferID} name={filePath} 
        cid={channelID} cpw={channelPassword} seekpos={seekPosition}

Initializes a file transfer download. clientftfid is an arbitrary ID to 
identify the file transfer on client-side. On success, the server generates 
a new ftkey which is required to start downloading the file through 
TeamSpeak 3's file transfer interface.

Example:
   ftinitdownload clientftfid=1 name=\/image.iso cid=5 cpw= seekpos=0
   clientftfid=1 serverftfid=7 ftkey=NrOga\/4d2GpYC5oKgxuclTO37X83ca\/1 port=...
   error id=0 msg=ok