Recently, I came across the error below when attempting to open a large document library in Explorer View :
Some/SharePoint/Folder is not accessible. You might not have permission to use this network resource. Contact that administrator of this server to find out if you have access permissions
Seeing as I am the administrator of the server, the site collection, the web application and the entire farm itself, I think I pass the permissions test. It turns out that the real culprit has absolutely nothing to do permissions in any way.