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It's easier than that probably: The length restriction is on the entire path, so just move it to the top level of your hard drive. or /temp/ or something like that.
(That is: Windows is dumb about this, it let you (or some software) create it because the /entire/path/to/the/folder/name/excluding/the/title was short enough, but once the book title got added, it was too long, so now it won't open. So make /the/path/shorter/ until you're under the character limit, then process as usual. Calibre will never make paths that go over the limit, it's smarter than Windows.)
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