If you have been using Cyberduck on Windows and have encountered the error Could find part of the path when you try have Cyberduck automatically download an open a file for editing, you tmp directory may be corrupted from a previous instance of editing.
The tmp directory is used by Cyberduck to store the downloaded files when you edit them directly from the program.

A quick fix:
– Run > %temp%
– Delete Cyberduck’s tmp directories (or delete all if you don’t need the contents of tmp)

Try to edit the file again and it will open successfully.