Using SharePoint Open with File Exployer - works with Windows 7 but not with 8.1

Question

I am using a SharePoint site. There is an option to open the site in File Explorer [Open in Explorer] that I can use with Windows 7 computers with no problems.  However, when I try to use in Windows 8.1, I receive an error message telling me to add
the SharePoint site to my trusted sites even though the site is already a trusted site. I can use this SharePoint command on multiple Windows 7 computers with no problems.  I set the Windows 7 computer next to the Windows 8.1 and used the same
I/E 11 with the same security settings.  Works for 7 and not for 8.1.

Answer 1

Hi，
For your issue, try to do the following:
Click Start > Run->Enter "services.msc" ->Find the WebClient service and select Restart.
In Internet Explorer go to Tools > Internet Options > Security->Local intranet->make sure the AcitveX control is enabled.
Enable Basic authentication on the client computer, by setting the BasicAuthLevel registry entry of the following key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WebClient\Parameters
For detailed steps, refer to the KB:http://support.microsoft.com/en-us/kb/841215
Also, here are some troubleshooting articles, you can use as a reference:
http://blogs.technet.com/b/asiasupp/archive/2011/06/13/error-message-quot-your-client-does-not-support-opening-this-list-with-windows-explorer-quot-when-you-try-to-quot-open-with-explorer-quot-on-a-sharepoint-document-library-in-office-365-site.aspx
https://support.office.com/en-au/article/Fix-problems-opening-documents-in-SharePoint-libraries-31329fa1-4ad0-47fc-95d8-bb0c5b12a536
Besides, here is a similar post, you can use as a reference:
https://social.technet.microsoft.com/Forums/office/en-US/9f03bdb1-d087-4c8e-8cde-8a2e1471e0cf/file-explorer-not-opening?forum=sharepointadmin
Best Regards，
Lisa Chen
TechNet Community Support
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