My favorite tool for dealing with long filepaths is muCommander. It is a Java app that mimics the traditional "Norton Commander" user interface. Java uses the API in Windows that supports longer filepaths, so muCommander has no trouble dealing with extra long file paths. It's not just for Windows, though - it's available on a lot of platforms.
muCommander is much more than a better file explorer, too. It has built in support for loads of protocols:
Virtual filesystem with support for local volumes, FTP, SFTP, SMB, NFS, HTTP, Amazon S3, Hadoop HDFS and BonjourYou mean I can have my local filesystem on one side, and an SFTP session on the other? Awesome.
It can even open and edit zip files in-place.
Plus - it has a sweet logo.
muCommander is an awesome utility to keep in your toolbox.