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Hello,
Before the window cleaner came to our institute for his annual duty, I managed to save lots of dead flies from between the window panes. Here is one of the most interesting: about 1 cm long and in good condition except for some dirt particles. I would put it into Xylophagidae or Coenomyiidae, respectively, according to its peculiar antennae and habit. There should be only a handful of species in Germany, but the few pictures I found show animals different from mine. Therefore I ask for help and give a series of pictures that hopefully display important features for identification.
Sundew

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Second series: head characters. Upper right: mouth parts viewed from below.

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Third series: side view (hairy scutellum), upper right: abdomen tip viewed from below. Below: view of hairy hind tibiae (right) folded before the stout femora with dark spots.

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Last series.

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With my poor knowledge in orthorrhapha, I would say Solva marginata (Xylomyidae).

Greetings.

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Me too. I have lots of S. marginata images on my web site.

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Solva marginata sounds good! So not Xylophagidae, but Xylomyidae - wood is still involved, anyway. And there are still less species found in Germany, so I am glad I got one. Many thanks for ID!
Sundew