[X4U] Double Apps in "Open With" menu

[Kirk McVey]

In the finder, when I right-click on a file (a .jpg for example) and  
select the "Open With" menu, I get a double listing of all the  
programs that could open it (Photoshop twice, Illustrator twice,  
Safari twice, etc.). I've searched for duplicates and there are none.  
I've also looked in the contextual menus folders and don't see anything.
What am I missing? Does any one else have/had this issue? If you  
could direct me, I'd appreciate it. I'm using OS X 10.4.1.