Comment by _carbyau_

Regards " stability issues with Explorer", I doubt it is Explorer itself.

2 thoughts:

1. Possibly something hooked into Explorer. Not necessarily malicious but could be like an acrobat extension or image editor extension or similar that helps to make thumbnails/previews. Or a context menu hook in.

Use Sysinternals Autoruns [0] to have a look. It is a free diagnostics tool from MS that shows everything that loads on startup. It looks at Start menu Startup folder, registry run and runonce keys and a bunch more places where things are hooked in. No restarts or anything required simply to look. It will show plugins/addons to Explorer too. Easy disable/re-enable process allows for somewhat easy troubleshooting. You'll have to restart Explorer after a "disable" step to see the results though.

Be sure to use the "hide microsoft entries" option if you want to narrow it down some.

2. Filesystem filters - things like antivirus "scan on read". If a "scan on read" goes to an antivirus that is not playing ball it will halt the "file open" request for example.

The command "fltmc" will list filesystem filter drivers. But making sense of which one belongs to what software is a further exercise. Which is why I suggest this investigative path as number 2...

[0]:https://learn.microsoft.com/en-us/sysinternals/downloads/aut...