WMP11 - Some media (AVIs) not listed on UPnP Client

Help, please!

I'm using two UPnP servers, Windows Media Player 11 (WMP11) Media Server and
Twonkyvision to host the same directory of media files. When I browse to the
files using my UPnP client (Zensonic Z500), the AVI files are not displayed
from WMP11 but do appear using the Twonky server. MPEG files show up in both
cases.

Looking into this and spending way too much time, I finally did an ethernet
trace of the communication between the Z500 and the UPnP servers. I think I
uncovered a bug in WMP11 but don't know (a) if it's actually a bug, and (2)
where to report it. Here is my reasoning.

Communication from the client is an HTTP POST to request the data, and the
server responds with XML formatted information. Both WMP11 and Twonky servers
generated similar data for the MPEG files, but the AVI files were
significantly different.

WMP11 AVI Info
<item id="{22BF465E-206C-4644-BCFE-933B952749A0}.0.54E8CB7E" restricted="1"
parentID="54E8CB7E">
<dc:title>Go Diego Go! A Blue Morpho Butterfly is Born</dc:title>
<res protocolInfo="http-get:*:video/avi:DLNA.ORG_OP=01;DLNA.ORG_CI=0">
http://192.168.2.104:10243/WMPNSSv3/233091249/1_ezIyQkY0NjVFLTI0uMC41NEU4Q0I3RQ.avi</res>
<upnp:class>object.item.videoItem</upnp:class></item>

Twonky AVI Info
<item id="3$51$1281647728$2758042843" parentID="3$51$1281647728"
restricted="1">
<dc:title>Go Diego Go! A Blue Morpho Butterfly is Born</dc:title>
<res
protocolInfo="http-get:*:video/x-msvideo:DLNA.ORG_PN=AVI;DLNA.ORG_OP=01;DLNA.ORG_FLAGS=01" >
http://192.168.2.104:9000/disk/DLNA-PNAVI-OP01-FLAGS01700000/video/O3$51$1281647728$2758042843.avi</res>
<upnp:class>object.item.videoItem.movie</upnp:class></item>



The interesting bits from this is the "protocolInfo" reported by both servers.

WMP11: http-get:*:video/avi:DLNA.ORG_OP=01;DLNA.ORG_CI=0
Twonky:
http-get:*:video/x-msvideo:DLNA.ORG_PN=AVI;DLNA.ORG_OP=01;DLNA.ORG_FLAGS=01

My observations:
(1) WMP11 does not include the flag DLNA.ORG_PN=AVI, Twonky does.
(2) WMP11 reports the MIME type for the AVI file as video/avi, Twonky
reports it as video/x-msvideo.



Trying to eliminate the "works" from the "doesn't work", I looked at the
protocolInfo for the same MPEG file on both servers, which are listed on the
Z500 in both cases.

WMP11:
http-get:*:video/mpeg:DLNA.ORG_PN=MPEG_PS_NTSC;DLNA.ORG_OP=01;DLNA.ORG_CI=0
Twonky:
http-get:*:video/mpeg:DLNA.ORG_PN=MPEG_PS_NTSC;DLNA.ORG_OP=01;DLNA.ORG_FLAGS=01

MIME type is the same, DLNA.ORG_PN flag is included in both items.



I don't know the UPnP protocol, but this leads me to the conclusion that
WMP11 and/or the Z500 has a bug.

Observation (1) : WMP11 must include the DLNA.ORG_PN flag when reporting AVI
files.
Observation (2) : Z500 must list the AVI file according to its MIME type and
not rely only on the DLNA.ORG_PN flag.


Sorry the post is so long. I wanted to be as complete as I could. Hopefully
someone with a lot more experience than I will have some insight into this
annoying issue. If this is a bug in WMP11, does anyone know where can I
report it?

Thanks,
Dennis L