This packet is designed to acknowledge a Secondary clients PM message to a WPN client selected by the requesting Secondary client, the acknowledgement is directly from the currently connected primary client and not the client the message was sent to.

[0x13ED][ Packet Data Length : 2 ][ "WinMX " : 6 ][ User IP & Port  ASCII : 12 ][00:1][ UserName : S ][ 00 : 1 ][ *"SENT" : 4 ][ 00 : 1 ]

* Possible message strings are "SENT","User is ignoring you", "User is Ofline" possibly others
This packet is received in response to a 0x13EC packet.