I was thinking the same thing. I searched the registry the other day but didn't find it. Scanned with malwarebytes and superantispyware but they didn't find anything either. It didn't pop up tonight. Odd.
Sometimes I get a strange window that pops up when DCS starts and stays up until it is closed. It started after the F-18 update. I've never seen it before. In task manager it shows as a DCS process. Anyone else have this or know what it is?