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PathLen is a lightweight application that enables you to easily identify the longest paths on your system. It expects a path as parameter, and displays a message box with path information and length. If a directory path is given, the longest path in the structure is reported. Optional prompt to open folder (Explorer window)

In order to use the program you need to create a shortcut on the desktop and drag&drop any path from the Windows Explorer onto the shortcut. Or make a shortcut in your SendTo folder, and use context menu / SendTo.

Note: The maximum path length that Windows can handle is 259 characters.
If the initial path (parameter) is longer, Windows will fail to run PathLen.
However, the longest path that is found may be longer, and will be reported.