Using Registry Editor
Once you have Registry Editor opened, and your backup made, navigate to the location
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem
and find the key LongPathsEnabled. Double-click on LongPathsEnabled.
In the Value data: field, make sure the number 1 is in there.
Click OK to commit the change. Exit Registry Editor and you should be able to work with crazy long file paths now.
Using Group Policy
Once the Group Policy Editor opens, navigate to Computer Configuration > Administrative Templates > System > Filesystem. There you’ll see the policy Enable Win32 long paths.
Double-click on it to edit the policy setting. Change it from Disabled to Enabled, then click the OK button to commit the change.
The policy may not take effect
right away. Reboot the system and check.