Uploading swf shows up as source code in browser

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I have created some tutorials in Camtasia and saved them as swf files. I usually upload the swf and give my students the URL. By keeping them as swf’s, the students can resize the window/animation. I uploaded two today that did not work properly. When I look at them in the browser, I see source code rather than the swf. The code starts with “FWS” followed by that rectangle character and then additional characters or text. To see what I mean, here is the link: http://djcc.lisd.net/camtasia/zombie2.swf. Am I doing something wrong. Yes, I could embed the swf in the html, but then the students couldn’t resize.