Every time I start qbittorrent v4.1.0 in Windows 10 x64, I get a "torrent" of messages from AVG complaining about favicon.png.
I did a search of this issue, and it seems to have been mentioned a lot a few years back, including a fix by way of a checkbox in the Desktop section of the Behavior section of the Options dialog. However, I don't see a checkbox about favorite icon!