How OverDrive Media Console works in Windows 8
The first thing you need to know is that Windows 8 comes in two basic flavors. There's Windows 8, which can run legacy desktop apps, and Windows RT, which cannot.
Why is this important? If you're running Windows 8, then you can install OverDrive Media Console (OMC) for Windows 8 as well as the classic desktop version of OMC.
How do I know which one I'm using?
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Open the Search charm (Windows key + Q or swipe left from the right edge of the screen).
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Type System.
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Select Settings on the right, then System on the left.

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A window pops up in desktop mode and show's you which version of Windows you're using.

What's the difference between OMC for Windows 8 and the classic desktop version?
OMC for Windows 8 utilizes Microsoft's new Modern UI. With it, you get live tiles and refreshed graphics for EPUB eBooks and MP3 audiobooks. OMC for Windows 8 does not, however, support WMV or WMA titles. This version can be used with both Windows 8 and Windows RT.

If you want WMV (video) or WMA (audiobooks and music) support on your Windows 8 machine, then you will need to use the classic desktop version of OMC. This version can only be used with Windows 8 because it requires 'Desktop mode.'

You can even install both versions of OMC if you're using Windows 8 (not RT). That way you can read eBooks and enjoy the refreshed user interface on the Windows 8 version, while using the classic version to listen to or watch WMA or WMV files.