Contrary to what Apple states, QT 5 preview 3 can be installed on any MacOS, whatever the language, if you do the following :
- check with Sherlock all QuickTime files and trash them
- look into the extensions folder the file corresponding to Sound manager ('Gestionnaire de son' on French system, sorry i don't know for other languages) and trash it)
- install QT 5 preview 3
- restart your computer
For your info QT 5 preview 3 will last till April 15, 2001 (I hope the final will be released before).
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Fight against the Dark Force (Microsoft)