Copy failure involving long paths after compare operation

[snovotill]

How to duplicate issue "Copy failure involving long paths after compare operation" which affects all versions of WinMerge:

(1) Enable long path support in Windows as follows:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem]
"LongPathsEnabled"=dword:00000001
;"LongPathsEnabled"=dword:00000000

(2) Create a filename or filepath exceeding 260 characters, for example a text file named:
12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901.txt
This must be done via Windows Powershell since the GUI does not support long paths.

(3) Do a file compare between a local drive and a network drive.
The long-named text file will show up in the discrepancies window.

(4) Right-click the file and select to copy it from Left to Right.
The operation fails, likely because WinMerge is calling the deprecated Windows API instead of the currently supported version.