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At first glance this one looked like an overgrown Anthmyia. But I think it's rather a Muscidae. Moved about a lot and had a (to me) very strange way of walking: it sort of floated over the surface, legs didn't seem to be moving.
What can it be?

Size: ~9mm
Date: 24 July 2009
Location: On wooden railing around pond (Helsingborg, Sweden)

Thanks!