Ну все же хорошо закончилось :) А вообще —
там есть любопытные моменты:
This copy of dllhost.exe hosts thumbcache.dll. A bit of experimentation showed that if I create new .mp4 files then this process leaks 12+ WaitCompletionPacket handles per file when explorer creates the thumbnails. When I’m cleaning up vacation videos this can easily leaks hundreds or thousands of handles. I mentioned this on twitter, twice. I also reported it on Feedback Hub (only visible to non-corporate users on Windows 10). An ETW trace showing me creating 20 .mp4 files and leaking hundreds of handles can be found here. This should be fixed.