There is now a GUI available for RTMPDUMP if you have Micro$oft's .NET Framework 4 installed.
It requires Windows XP Service Pack 3, Windows Vista Service Pack 1, Windows Server 2003 Service Pack 2, Windows 7, or later. But it is not supported on Windows Server 2008.
Details are in this thread:
RTMPexplorer - rtmpsrv/rtmpsuck/rtmpdump GUI for Windows
It requires a Pentium 1 GHz processor or higher, with 512 MB RAM or more.