Flash Player installed but unable to see Flash-files

Hi all, according to 'about:plugins' on my Mozilla 1.7x, the Flash Player is installed: --- Shockwave Flash File name: libflashplayer.so Shockwave Flash 7.0 r25 MIME Type Description Suffixes Enabled application/x-shockwave-flash Shockwave Flash swf Yes application/futuresplash FutureSplash Player spl Yes --- but when I want to see a webpage with a Flash animation on it, Mozilla complaints with: --- The file "filename.swf" is of type application/x-shockwave-flash, and Mozilla does not know how to handle this type of file located at: http://.... ... --- What am I doing wrong? TIA, Martin