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@webfork
Findings Seconded, your honour...
Indeed,
Simple Duplicate Finder v1.2.0.3 (née Duplicate File Finder ) leaves no objectionable Registry traces whatsoever.
Furthermore, here is a germane transcript from a recent Comments section post:
Simple Duplicate Finder v1.2.0.3 - link date 20-FEB-2012
Just re-discovered this antediluvian gem of a dups finder...
What's not to like ?
• Terse, elegant, skillfully crafted GUI
• Option for similitude percentage match (shades of AntiDupl.NET ? )
• Filter for file extension
• Duplicate entries results neatly listed as offset to the stem file
• Stunningly fast execution (files CRC used as match criteria)
• Tiny footprint (117KB exe)
Leanest of TPFC's "Duplicate Checkers" current 11 entries
Oldie, but goodie...Recommended.