In my experience, QT and RP are flaky and prone to take over the file associations of other media types. I'm guessing that that is what is meant by hijacking. File associations are what windows uses to assign which program is used to access/use/play a file.
AVI is a file format that many, many codecs can be used to create. DivX is becoming the codec de jure and is a decent product. While RM (*.rm, *.ram, etc.) and QT (*.mov) can produce a smaller package, I don't like having to four media players on my computer. I only install QT because a lot of websites stream their content in QT format.
You can go into the settings of each program and assign the file associations so that QT only opens *.mov and RP only opens the various RP formats. I set MP to open everything else except for *.mp3 which is reserved for Winamp.
Funny thing about MP is that it won't play DVD's unless you have a 3rd party DVD program installed.
Hope that helps.
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I have gained this from philosophy: that I do without being commanded what others do only from fear of the law. - Aristotle
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