.smi file failure in stats?

I have a site which consists of short tv vid clips in mpeg format. From the statistics I can see the most recent files may be downloaded 20-30 times a day at the most. For the past few days 1 or 2 older files which usually don’t get much notice get downloaded 87 times per day, and in the failure report, someone is looking for these same file names except with .smi as the file type. Any idea what this is about?

Yes that’s true, thanks for the file info. I had looked smi up too, but couldn’t find a reason why it would be repeatedly asked for. It seems like some is requesting the same non-existant file dozens of times, so it makes me wonder what the crawling is from.