I finally found a way to deal with the disappearing files on win 10
Which happens quite often. File goes missing from desktop. You search the screen inch by inch and then do it again
Still missing
Open explorer, and it is there
Usually I solve this with a 'taskkill /f /im explorer.exe' and restart explorer
But there seem to be an icon representing lego blocks with a measurement tape next to it. Does not seem to do anything intuitive, but if you random click enough the icons get back
But what they didn't tell you is that we secretly replaced their coffee with Folger's Crystals that the display is an OLPC XO screen in black and white mode