Does this work?
Thanks for your time on this but it does not work.
I got a hint of correct syntax from your answer.
#target "photoshop-55.032" as I am using on Mac.
A little late to the game, but I just installed CC so really needed to target CS6 specifically.
Like virender_CTS mentioned, doing #target "photoshop-55.032" will target you CS5.5.
You can also just do #target "photoshop-55" to get all versions of CS5.5, and for my needs, #target "photoshop-60" targets all versions of CS6.
If you're unsure of which version number you want, check the target dropdown in the top left corner of ExtendScript Toolkit, and it will list the versions of Photoshop you have installed.