access win 10 shares
In the credentials dialog, give your Windows 8.1 username as Computer_name\Username, for example if the Win 8.1 PC is MyMonsterMachine and user profile is SuperGeek give the username as MyMonsterMachine\SuperGeek. This changes the domain from the Win 10 PC to Win 8.1 PC. Reference: http://www.tenforums.com/network-sharing/4857-build-10041-cant-access-win-8-1-shares.html