without this runtime surveillance monitor...

strange name sounds like surveillance state

Runtime Broker Process

If Runtime Broker is present in your system:

All settings for your prefered file extension program will be ignored - sometimes - and the selection dialog presented...

Same issue since 2 or 3 weeks

On win7 64bit black screen (sometimes - 10 times in a second error 4101 in system log) - also BSOD on this issue!

Updated to win10 64bit same issue BUT no BSOD and...