As suggested, I tried AutoHotkey. fix_printscreen.ahk
works:
#+O::PrintScreen
But the annoying overlay still appears.
Searching the Registry for "Skype for Business 2016" returns a bunch of Office 2016 keys such as Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\REGISTRY\MACHINE\Software\Microsoft\Office\16.0\Registration\{BDB32189-C636-46CD-A011-FFB834B552D9}
(also strange because I've uninstalled MS Office), leading me to find this service (with German description): "C:\Program Files\Common Files\Microsoft Shared\ClickToRun\OfficeClickToRun.exe" /service
, but stopping and disabling that didn't stop the overlay. I've modified the values, but even after a reboot the overlay text didn't change.
Via Process Monitor I found the cause: C:\Program Files\WindowsApps\E0469640.LenovoUtility_3.2.1.0_x64__5grkq8ppsgwt4\VFS\ProgramFilesX64\Lenovo\LenovoUtility\utility.exe
, launched by C:\Users\Cees\AppData\Local\Microsoft\WindowsApps\lenovoutility.exe
aka LenovoUtilityUWP
in Task Manager's Startup tab:
Disabling that and ending its task worked: