What is an atn file and how do I open an atn file?
An ATN is a Photoshop Actions file that contains one or more actions recorded in Photoshop, and is used for automating common editing steps and for batch processing images. ATN files can be saved and loaded using the pop-up menu in the Photoshop Actions palette.
Relevant atn file links:How to open atn file on Youtube
How to open atn file on Wikipedia
How to open atn file on Microsoft.com