If .swf files aren't associated with anything (if they are, go to View > Folder Options, "File Types" tab, and delete the entry for "Shockwave Flash Object"), you'll get a "wtf do I open this with" ...

Flash Professional 8 constitutes a leap in the evolutionary chain for Macromedia’s Web video and animation authoring program; it provides significant enhancements in scripting, graphical effects, ...