help: xvfwopts is not an MEncoder option ?????

tclwp

#mencoder 72540.rm -o test.avi -ovc vfw -xvfwopts codec=divx.dll -oac copy
MEncoder 1.0pre7try2-3.4.5 (C) 2000-2005 MPlayer Team
CPU: Intel (Family: 8, Stepping: 3)
Detected cache-line size is 64 bytes
CPUflags: Type: 8 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2

File not found: 'frameno.avi'
Failed to open frameno.avi
xvfwopts is not an MEncoder option

Exiting... (error parsing cmdline)

any help is appreciated!!!

Brain

check manpage of Mencoder
"xvfwopts" seems not a default  option of mencoder.
maybe it has some special format in using.