How to remove duplicate apps and documents in finder?

When I do an Open With, I get numerous instances of every app.  It is due to my use of a SuperDuper mounted drive.  Spotlight indexes that drive.
Now I have tried two different ways for months to fix this:
1) Preferences -> Spotlight -> Privacy, Add drive.
2) Terminal ->
$ sudo mdutil -i off /Volumes/SuperDuper
In using either method, it always works immediately for a few days.  Then the behavior consistently returns due to no explicit intervention on my part, and Spotlight starts reindexing the drive.  Is there a real solution to this annoyance?  I suppose I could stop using that drive completely, or stop using Spotlight.

It's LaunchServices. These are only cache files but can get corrupted. Launch /Utilities/Terminal and copy & paste this at the prompt to rebuild LaunchServices: (be sure to copy the entire line it's a scroll)
Code:
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user
Then press return. Wait until terminal returns to the command line. Quit Terminal. After that, log out and back in or restart. Let us know

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