Before Windows 95, Windows only allowed file names that were eight characters long, with a three character file extension–commonly known as an 8.3 filename. Windows 95 abandoned that to allow long file names, but still limited the maximum path length (which includes the full folder path and the file name) to 260 characters. That limit has been in place ever since. If you’ve ever run into this limit, most likely it was when you were trying to copy deep folder structures into other folders, such as when copying the contents of a hard drive to a folder on another drive. The Windows 10 Anniversary Update finally adds the option to abandon that maximum path length.
Home Users: Remove the 260 Character Path Limit by Editing the Registry
If you have a Windows Home edition, you will have to edit the Windows Registry to make these changes. You can also do it this way if you have Windows Pro or Enterprise, but feel more comfortable working in the Registry than Group Policy Editor. (If you have Pro or Enterprise, though, we recommend using the easier Group Policy Editor, as described in the next section.)
Standard warning: Registry Editor is a powerful tool and misusing it can render your system unstable or even inoperable. This is a pretty simple hack and as long as you stick to the instructions, you shouldn’t have any problems. That said, if you’ve never worked with it before, consider reading about how to use the Registry Editor before you get started. And definitely back up the Registry (and your computer!) before making changes.
To get started, open the Registry Editor by hitting Start and typing “regedit.” Press Enter to open Registry Editor and give it permission to make changes to your PC.
In the Registry Editor, use the left sidebar to navigate to the following key:
In the value’s properties window, change the value from 0 to 1 in the “Value data” box and then click OK.
You can now close Registry Editor and restart your computer (or sign out of your account and sign back on). If you ever want to reverse the changes, just head back to the LongPathsEnabled value and set it from 1 back to 0.
Pro and Enterprise Users: Remove the 260 Character Path Limit with the Local Group Policy Editor
If you’re using Windows 10 Pro or Enterprise, the easiest way to disable the new app install notifications is by using the Local Group Policy Editor. It’s a pretty powerful tool, so if you’ve never used it before, it’s worth taking some time to learn what it can do. Also, if you’re on a company network, do everyone a favor and check with your admin first. If your work computer is part of a domain, it’s also likely that it’s part of a domain group policy that will supersede the local group policy, anyway.
In Windows 10 Pro or Enterprise, hit Start, type gpedit.msc, and press Enter.
In the Local Group Policy Editor, in the left-hand pane, drill down to Computer Configuration > Administrative Templates > System > Filesystem. On the right, find the “Enable win32 long paths” item and double-click it.
In the properties window that opens, select the “Enabled” option and then click “OK.”
You can now exit the Local Group Policy Editor and restart your computer (or sign out and back in) to allow the changes to finish. If at any time you want to reverse the changes, just follow the same procedure and set that option back to “Disabled” or “Not Configured.”
The maximum path limit may not be something you’ve ever run into, but for some people it can certainly be the occasional frustration. Windows 10 has finally added the ability to remove that limit. You just have to make a quick change to the Registry or Group Policy to make it happen.
link from https://www.howtogeek.com/266621/how-to-make-windows-10-accept-file-paths-over-260-characters/1