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any time you stream a media clip through a player, from somewhere on the internet, chances are, there will be an accompanying smil (.smi) file.
my computer dumps them into my TEMP directory. I have to remember to clean it out once in a while.
Smil is a subset markup language of xml. It's been a few years, but if memory serves me, you can't just click on a .smi file and play it. A smil file is usually embedded or referenced in the metadata of a host file, usually the player's native file format, like .ra for real audio, .mov for quicktime, and possibly .swf for flash.
I'd look for a third accompanying file on your machine before trashing the .smi files. The mp3 you spoke of may have some kind of transitional effect (fade-in/out, time delayed start, etc) driven by the .smi file, referenced in even an html file. If all you want is the mp3 file , then trash the smil files.