I can't quicklook .avi files in finder after I change their extension (from .vlc or .mkv)

The title says it all.
I received a few movies from a friend and some of them were in formats such as .mkv or others, but I couldn't quicklook them with the preview function in finder. I tried to change the extension to .avi since with that format I can always watch movies like that, but it doesn't work. I think it has to do with the fact that I simply typed a new extension in the label, which maybe means that the file is not 100% converted? I don't really know.
Any solutions?

I used to be able to use Quick Look to view MKV files, and then it stopped. I've been playing around with this the last few days, and now it works again.
I have Perian 1.2.3 already installed like yourself. On a hunch, I re-installed MPlayerX 1.0.17, and Quick Look worked again for MKV files. This seemed to work on my Mac Pro (10.6.8).
However, on my MacBook Pro (10.6.8), I don't have MPlayerX installed, but Quick Look works on MKV files anyway. I don't know what components Quick Look needs for MKVs, but you can try this method to see if it works for you.

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