ie7/ie7-standard-p.js not found.

I keep seeing this error in my logs: ie7/ie7-standard-p.js not found.

They usually show up in groups of four or five in a row. I've searched drupal.org but don't see anything about this. When I view the full log entry there is no referrer listed. Has anyone else seen this or know where it's coming from?

Thanks,
Gene