http://www.forgottenfutures.com/game/rules/ffutures.pdf is such a document if you need one.
later - four responses, all showing that Acrobat is using the default browser, NOT IE. Sounds like something wrong here
Later still - cracked by sbisson; my default browser in "set program access and defaults" was "use current browser" not "Use Opera." And a while ago I was having trouble with a site and set Opera to identify itself as Internet Explorer. So Acrobat tries to open the pages in the "current browser" but reads it as IE, not Opera, and opens the wrong browser.