Bernadette

I was testing the Prism converter before buying. I was pleased with the way it converted some flash files - swf - to MP4, but then for other .swff files it simple says ' cannot open video stream from file' I am happy to buy the program but I do not want to buy it if it will not open .swf file that play perfectly well on my desk top, so are not corrupt. Any suggestions from anyone would be most helpful. Thank you Bernadette