Why does finder report my applications are in the trash when I use Open With? When I attempt to open a a file with Preview (and some other applications) via the Open With open I get the following error:




  You can't open the application "Preview" because it's in the Trash. To
  open this application, move it from the Trash.


If I open Preview from the applications menu or Spotlight it opens fine. 

This may be related, but there are some duplicate applications in my Open With menu, and some that I have deleted. How do I manage these?
As Lri suggested in a comment, rebuilding my Launch Services seems to have fixed the issue.

To rebuild launch services run the following from a Terminal:

 /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user


Took just a second and cleaned up the duplicates too.