I'm really happy finally to have Pleco on a Windows computer using Arc Welder after so many years. It mostly performs well on my Windows Surface Pro but there are three things which don't really work. One of these is there is no connection to the camera, but this isn't a particular problem for me. The second is the problem with the touch screen, but as others have noticed it seems to work fine as long as you use the pen rather than your finger. The third problem I've had is trying to backup flash card files. Instead of providing a "save file" window, it gives me a "open file" window that obviously then doesn't allow a backup file to be saved.
I realise that Pleco doesn't officially support Arc Welder, but I'd be grateful if anyone could suggest a solution to this backup problem, because I'd really like to be able to synch between phone and Windows. Alternatively, if Mike is thinking about optimising performance on Arc Welder then perhaps there is a change that could be made in Pleco that would prevent the problem in a future release.