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Well, the whole point of the questionmark was that I don't know.;)

But thanks to your suggestions I checked both the Drosophilidae and the Lauxaniidae, and it actually looks quite a lot like Setulina. The S. cf. Geminata in the gallery has a different wing pattern, but when I use Google it appears the species has actually two different wing patterns, one of which looks remarkably like the one of my specimen. I'll change the name for now, but I hope someone is willing and able to confirm this tentative ID.

Best regards,

Scarabaeoid