The Windows 10 upgrade may delete the registry hack applied in Windows 7 to let you open a SharePoint library in Windows Explorer.  Follow these steps to enable Windows Explorer to access SharePoint Project Sites without prompting for a password.

  1. Click on WebClientParameters.reg attached to this page
  2. After it is downloaded double click to open and apply the changes
  3. Answer Yes to the questions
  4. Click on your Windows "Start" button in the lower right
  5. type services.msc [enter]
  6. Scroll down to the service name WebClient, right click on it and select restart
  7. If you have trouble running services you can also reboot your computer
This is a one time task you should not need to do this again unless an update from Microsoft removes this setting.