File fails to open with long paths

[rvail]

Description of the Issue

On Windows 10 Trying to open a file on a network share that has a very long path (over 260 characters) fails.

Steps to Reproduce the Issue

1. Enable long path support on Windows 10
   https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file#enable-long-paths-in-windows-10-version-1607-and-later
2. Create a directory tree with very long path (over 260 characters) on your network drive
3. Create a text file at the bottom of the tree
4. Open the file with notepad++

Expected Behavior

File opens normally

Actual Behavior

File does not open

Debug Information

Notepad++ v7.8.7 (64-bit)
Build time : Jun 5 2020 - 02:38:56
Path : C:\Program Files\Notepad++\notepad++.exe
Admin mode : OFF
Local Conf mode : OFF
OS Name : Windows 10 Pro (64-bit)
OS Version : 1909
OS Build : 18363.836
Current ANSI codepage : 1252
Plugins : ComparePlugin.dll mimeTools.dll NppConverter.dll NppExport.dll NPPJSONViewer.dll XMLTools.dll

[andry81]

#9181 (comment)