It seems impossible, since WinRT has a completely different set of APIs, and all existing win32-based codecs will not run unless codec owners rewrite them. One long way will be to port win32 code to winrt, which will require a deep knowledge of both and seem too long to do. Even if you somehow find a way to make an existing codec work, it will not work on tablets with 8-inch windows.
This means that there are no codecs for winrt other than those provided by Microsoft.
Your options to convert them to h.264 video, which has become the standard for h.264 games on all devices. Apple did an excellent job standardizing the video. Win 7 onwards, Microsoft has provided native support for h.264.
Akash Kava
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