windows 7 - File name too long to copy but doesn't say which one

I was copying a bunch of files but wasn't able to copy some because there name was too long. Is there an easy way to shorten the names or can I at least know the path to where the file name becomes too long?

EDIT: by bunch of files I mean there are two directories each containing files and more directoris containing more files etc. I'm simply copying by ctrl+c