[BSchina]

THANK YOU BOTH FOR YOUR HELP !

To adicoto : They call it QT Lite (QT Lite is a lightweight version of QuickTime. It contains only the essential components that are required for viewing QuickTime content in your favorite browser.) I downloaded it here : Free-Codecs.com :: Download QuickTime Alternative (QT Lite) 2.8.0 : QT Lite is a lightweight version of QuickTime.

I am right now downloading QT Alternative in case there is a difference (?) and will install it asap...

To BSPeter : Yes as during installation BSPlayer asked me somethink like "do you want to download the missing codecs?" I answered yes and it took several minutes to download the codecs.

What is surprising is that when I googled for "CoreMultimedia.dll" to get more info, it showed that this dll is related to Corel. Ok I have Corel Paintshop Pro XI installed on my laptop but I don't understand the relation with BSplayer (?)