[M4IF Technotes] Location of reference software

[the_ether]

Where can I find the reference software?
I have downloaded some code from the ISO site pointed to by the M4IF site,
namely:
http://www.iso.ch/iso/en/ittf/PubliclyAvailableStandards/14496-5_Compressed_
directories/Visual/
But I suspect that there is another version. I am specifically looking for
code that implements 1/4 pel estimation but I couldn't see it in either the
MoMusys or Microsoft versions. I searched for key words, skimmed through the
files that looked appropriate and finally searched for the numbers 160
or -48: two of the filter coefficients used in 1/4 pel estimation.
I came across ISO document N4278 from the group WG11 which referred to code
video/natural/microsoft-fdam1-2.3-001213
The name of the last directory is very different to the one that comes in
the zip file that can be downloaded from the ISO site pointed to by the M4IF
site. The name of that directory is microsoft-vfdis-v10-990812.
So all this leads me to believe that there is some more reference software
somewhere.
Any ideas?
graham