We get "App didn't start in required time when using file explorer".

For example one can not view images in local (and fast) hard disks with file explorer anymore!

It looks like the concept "app" has been implemented into the latest Windows 10 update
and the OS tools such as file explorer get timeout.

The Windows 10 component
1) did not inform anything about itself !
2) nor how much time it had !
3) nor the time it had needed!
4) nothing about the operation it was performing!