You should most likely already have the Flash Player installed (it comes
with most windows versions)

So you simply open the SWF file directly or (more usually) open a web page
that has the SWF file embedded in it.

If you don't have Flash Player, go to www.adobe.com and install it
--
Jeckyl

drag&drop the swf file in an opened IE window

hth

--
-----
Ned