> On Mar 31, 2016, at 5:24 PM, a2z <apple2ze...@gmail.com> wrote:
> 
> I need to add 'Zip' and 'Unzip' menu options to Finder.  When selected it
> would launch my Application to Zip and Unzip files.  I understand that I
> need to implement services for this and 'Service Implementation Guide' is
> the place to start, correct me if I'm wrong.
> 
> Is this kind of implementation supported on older Mac OS X.  If yes what is
> the earliest OS that can be supported.

Services have been around forever on OS X. 
The modern way would be to write a Finder Extension bundled in your app though. 

As for Zip/Unzip, I'd recommend bundling your own copy of libarchive 
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