I sent the mp3s via PlayTo and they worked, so I assumed they are supported.
For completeness, GetProtocolInfo returns:
http-get:*:audio/mp4:DLNA.ORG_PN=AAC_ISO_320,http-get:*:audio/3gpp:DLNA.ORG_PN=AAC_ISO_320,http-get:*:audio/x-ms-wma:DLNA.ORG_PN=WMAFULL,http-get:*:audio/x-ms-wma:DLNA.ORG_PN=WMABASE,http-get:*:audio/mpeg:DLNA.ORG_PN=MP3,http-get:*:audio/L16;rate=48000;channels=2:DLNA.ORG_PN=LPCM,http-get:*:audio/L16;rate=48000;channels=1:DLNA.ORG_PN=LPCM,http-get:*:audio/L16;rate=44100;channels=2:DLNA.ORG_PN=LPCM,http-get:*:audio/L16;rate=44100;channels=1:DLNA.ORG_PN=LPCM,http-get:*:audio/x-flac:*,http-get:*:audio/wav:*,http-get:*:audio/mpeg:*,http-get:*:audio/asf:*,http-get:*:audio/L16;rate=44100;channels=1:*,http-get:*:audio/L16;rate=44100;channels=2:*,http-get:*:audio/L16;rate=48000;channels=1:*,http-get:*:audio/L16;rate=48000;channels=2:*,mms.awox.com:*:*:*
I also tried always convert - same errors.
Selected "disable SetNext support"
try again. - Same errors.
tryed "Disable transport events"
Same Errors.
Doing the WireShark capture now, and will send it along.
Thanks for the help - you guys are the best!