I can play a .ra file through DirectShow in MC13.
I have a recently built PC with a rather clean XP. It doesn't have the full Real Player installed, only the Real Alternative codecs.
In addition to what is in my previous screenshot a have only set .ra to use JRiver audio renderer (see the new screenshot). I have let DS to determine the used filters automatically.
Here's my DS graph during .ra playback:
Filter Graph Info (Graph for type: ra):
Filter 'JRiver Audio Renderer'
CLSID: {EC1F74A8-7E55-4814-9F9F-D417489075CA}
Host:
Input Pin 'In'
Connected to pin 'XForm Out' of filter 'RealAudio Decoder'
Major type MEDIATYPE_Audio Sub type MEDIASUBTYPE_PCM, Format type FORMAT_WaveFormatEx
Filter 'RealAudio Decoder'
CLSID: {941A4793-A705-4312-8DFC-C11CA05F397E}
Host: C:\Program Files\RealAlt\RealMediaSplitter.ax
Input Pin 'XForm In'
Connected to pin 'Output 00 (Audio Stream)' of filter 'RealMedia Splitter'
Major type MEDIATYPE_Audio Sub type Unknown GUID Name: {4B4F4F43-0000-0010-8000-00AA00389B71}, Format type FORMAT_WaveFormatEx
Output Pin 'XForm Out'
Connected to pin 'In' of filter 'JRiver Audio Renderer'
Major type MEDIATYPE_Audio Sub type MEDIASUBTYPE_PCM, Format type FORMAT_WaveFormatEx
Filter 'RealMedia Splitter'
CLSID: {E21BE468-5C18-43EB-B0CC-DB93A847D769}
Host: C:\Program Files\RealAlt\RealMediaSplitter.ax
Output Pin 'Output 00 (Audio Stream)'
Connected to pin 'XForm In' of filter 'RealAudio Decoder'
Major type MEDIATYPE_Audio Sub type Unknown GUID Name: {4B4F4F43-0000-0010-8000-00AA00389B71}, Format type FORMAT_WaveFormatEx
Input Pin 'Input'
Connected to pin 'Output' of filter 'C:\test\Eine Alpensinfonie.ra'
Major type MEDIATYPE_Stream Sub type Unknown GUID Name: {57428EC6-C2B2-44A2-AA9C-28F0B6A5C48E}, Format type TIME_FORMAT_NONE
Filter 'C:\test\Eine Alpensinfonie.ra'
CLSID: {E436EBB5-524F-11CE-9F53-0020AF0BA770}
Host: C:\WINDOWS\system32\quartz.dll
Output Pin 'Output'
Connected to pin 'Input' of filter 'RealMedia Splitter'
Major type MEDIATYPE_Stream Sub type Unknown GUID Name: {57428EC6-C2B2-44A2-AA9C-28F0B6A5C48E}, Format type TIME_FORMAT_NONE
I attached also a short sample clip of my test .ra file. I encoded it in Real Audio 10 format with Real Player 11 (on another PC). You could try if it is any different.
I noticed that the sample file appeared as a data file after dragging it to Playing Now. That didn't affect playback because the new system can override the Media Type field value. I changed the media type to Audio and the file continued to work fine. However, it would be nice if Yaobing could fix this.