ListIT is an easy way to generate massive file lists from Windows directories that are easy to dedupe.

The ListIT application will scan Windows folders and sub-folders and create a spreadsheet listing of all the files it finds (or those that match specific criteria). It will also extract all of the metadata contained in the file as well as hash the contents of each file to aid in duplicate file detection.  ListIT is useful for system administrators, forensic computer practitioners, or any advanced Windows user.