There are many limitations in the Media Center for DVB-T.
Please refer to this link:
http://www.hauppauge.co.uk/board/showthread.php?t=4597
No DVB-T Radio stations are picked up
MCE2005 doesn't support DVB-T Radio under MyTV
(臺灣去年公視有試播2個Radio programs, 目前沒有任何Radio programs 播送)

What's Emerald?
Emerald is the internal codename for MCE2005 Update Rollup 2 which will be a free update to MCE2005 and will bring several enhancements.
- 支援更多的國家地區(No more "Unsupported Region")
- 支援 DVB-T Radio program
- ...

Source : http://msmvps.com/chrisl/archive/2005/06/19/54096.aspx
Windows XP Media Center Edition 2005 Update Due In August?
| According to Neowin….
Microsoft have been steadily testing an update for Windows XP Media Center Edition 2005.
The update which will RTM in August is expected to include support for the upcoming Xbox 360 and the following:
Native digital cable
Content Protection
Improve burning (DRM, network, Hi-def, DVD-RAM)
MCX on WinCE clients (Babylon, TV2 as stretch goal)
Playback reliability
Running 3rd party apps out of proc
Address top usability issues
Platform Security
Additional languages and locales
The update is currently being beta tested and is at Beta 2 stage. A release candidate 0 is expected to be released late July with an RTM following on August 12th for English, French, German, Korean and Japanese versions. Dutch, Italian and Simplified Chinese versions are expected to follow 2 weeks later.

ATSC AC3 Audio is supported in Rollup 1 Update.
But the DVB AC-3 Audio (Australia) is still not supported in Emerald ?
Do you want to try the RC0 ?

http://www.pcdvd.com.tw/showthread....0&goto=lastpost