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Drupal 6.x robot.txt

Historically drupal's files folder was installed at the root of the drupal installation and I think the rule do disallow /sites/ came from this era.

Following this thread:

Allow crawling of sites/default/files by search engines, don't disallow it in robots.txt

and implementing some of the advice from this post

This is the resulting robot.txt file - your mileage may vary - but works well enough for VisualFox and a couple of other site.