Problem solved.
It was the avast that moved the file to the quarantine. This action was listed in the history, I just haven't noticed because it was not in cronological order.
I inserted this exception in the avast scanning and hope it will not happen again.
Thank you.
Hello! I've been using my DASH CORE software running in windows 10 64 bits quite normally until yesterday morning.
When I tried to open dash core today, the dash-qt.exe was missing and the software did not launch. All the files are ok, including wallet.dat.
All I can remember is that yesterday...