A few weeks ago I had the unique privilege to be a part of the patching process for an OS patch at Microsoft.
The issue arose when folks were trying to open SharePoint in Explorer View mode to upload files to their SharePoint Online instance. They wanted to do a simple drag and drop of content up to their instance.
While doing this on Internet Explorer 10 on Windows 7 the Administrator was getting either one of these errors:
Error message 1
Your client does not support opening this list with Windows Explorer
Error message 2
We’re having a problem opening this location in File Explorer. Add this web site to your Trusted Sites list and try again.
A long story short the “WebClient Service” on the windows 7 specifically get turned off. If im honest I cant remember if it was as a result of installing IE10 or if it was something that in the process of upgrading browsers or native to Windows 7 was off. Again long story short this service is turned off.
The quick work around to see if you are experiencing the same issue that the hotfix will address is if you go to Start > Administrative Tasks > Services. Select the WebClient Service and start it as well change it to Automatic. Restart the machine. If you no longer see the issue you have found the problem.
The good news is there is a Hotfix for this and its live as of a few days ago. Check it out here
Glad I got to see the other side of updating a product, process was very similar but wow there are a lot of people working HARD behind the scenes to find and test fixes and get them out there ASAP.