How to automate removal of Duplicate files

Is there a way to automate the removal of duplicate files with LR2?
In my catalog of 62,000 files I have 7,300 that I believe are duplicates.
They are proprietary RAW files (CR2). I have the same files as DNG. At least I think I do.
My intention is to have all my RAW files as DNG only.

If you believe all of you CR2's are duplicates, just filter All Photographs by file type and delete all Raw's.
If you have unique CR2's (that have not DNG equivalents) you'll ned a third party utility that is able to detect duplicates ignoring the extension. Delete duplicates from drive, then use Synchronize Folder to remove missing files from catalog.

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