Apple Automator Action File
Automator is a function for Mac OS X that is used to automate frequent tasks, it does this by using a workflow which allows the user to setup his automation using the various steps needed before saving it.
There is a library of actions included in the Automator and it is possible to download more from the Apple web site.
The action files created or download use the .action file extension.
» Apple Automator
How to open .action files?
Software to open .action files
What are .action files