A simple website just consisting of HTML pages and links to swf-files hosted on Server 2008 R2, IIS 7.5, won't play the photogallery it is designed for. Just the frame comes up but no photos. The swf:s were generated four years ago through Lightroom 1.0 and played then without any problems on Sever 2003 IIS 6.0 (or 5.0??).
Today, opening the index.html directly through a browser play the old swf-files without problems. Generating an swf-site through the current 4.1 Lightroom version plays without problems through IIS 7.5.
So obviously the old swf:s are in some way different from the new ones. Since the old files played fine through the older version of IIS, there got to be a way to tweak IIS 7.5 to make them play. But how?