Most of the .mov and .AVI files doesn't play anymore with QT 7 or 10

I'm running OS 10.7.5 and most of the .mov files that were generated with Quicktime 7 doesn't play anymore, except in VLC.
I used QT7 because it can still crop and edit videos, instead of QT 10 that came with the system.
QT7 has a also a very nice feature that allow to reset the image ratio, which is sometime very usefull.
I shall say that videos came from a digital recorder I used to tape the TV and those files came as .AVI
Anyway, overnight (probably after an update of iTunes or any part of the system) QT 7 nor 10 can play those files anymore !
Each time I try to open a file with QT it says I need a codec, and leads to the DIVX download page, but installing this codec doesn't solve my problem.
QT7 was a very fine software and worked until now.
Why an update makes my system go backward ??!?
I'm a huge fan of Apple, but that is not acceptable !!!
It just makes me want to purchase on older mac and go back to 10.6 !!!
Shame on you Apple !

Indeed, a further search on the side lead me to this page :
http://perian.org/
and now it works again !
I still don't get how an update could change the system like this.
Anyway, thanks for the reply

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