I tried to post a reply earlier today, but was not able to as the server seemed to be down. All my typing was wasted
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The only major difference between TV in 9.0 and TV in 9.1 is the compression of audio in recording. In 9.0 audio is recorded in PCM format only. In 9.1 audio can be recorded in various formats of your liking.
You should be able to configure recording to WMV format, or in AVI format with video compression, in either 9.0 or 9.1 though.
If you are viewing TV already, use right-click menu, and select "TV Options" | "Configure TV ...". Otherwise bring up TV Options (by clicking the "Options" button on TV channel pad window) dialog box and click "Advanced" button.
Now click "Recording" tab. Under "Recording/Timeshifting Profile", select a profile. There are four preset profiles that are not editable, one of them uses Windows Media format. In your case you would want to create a custom profile, by clicking Add button. This will bring up a wizard that takes you through three (MC 9.0) or four (MC 9.1) steps. In the first step, you are to choose a name for your custom profile, AND select recording format, AVI or Windows Media. If you select Windows Media in the first step, then the second and third (9.1) step(s) are for timeshifting only, and would not concern recording. The last step concern recording quality, where you can choose "Best", "Good" and "Space Saver". On the other hand, if you select AVI recording, then you would pay more attention to the second and third (9.1 only) steps and select how recording is to be done. And you could just accept the default selections in the last step.