I recorded a presentation I gave with Camtasia, and when I wanted to show it to some folks, just copying the files Camtasia produces to IIS7 didn’t work.
The Camtasia Flash player displayed ok, but video didn’t start. I also noticed that “File Info” feature in Flash player reported file size zero. Linking directly to .mp4 file return error 404 – file not found.
Of course – mp4 mime type is missing! By default IIS has mime types for extensions .mp2 and .mp3, just add one and everything works again!