Lightroom links to uninstalled cs6 beta as default ext.editor

hi,

 

my lr4 installation links uninstalled cs6 external editor. want point cs5.1 still have on machine. see no way do, there no option change second external editor. hope make me understood. advance help.

either run cs5.1 installation again, or try solutions listed here: http://kb2.adobe.com/cps/401/kb401629.html

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