Combination logs contain both client stream and rendering data
and are identical to the logs sent by Windows Media Player for
Windows XP and earlier. Combination logs are sent when either of
the following conditions is met:
The client player is an earlier version. Players compatible
with Windows Media Player for Windows XP and earlier do not have
the ability to use the Fast Streaming feature or to generate
separate rendering and streaming logs.
Fast Streaming is not enabled for this session. Separate
rendering and streaming logs are only necessary when content is not
streamed in real time.