Files with the .atn extension are most commonly associated with the Adobe Photoshop image editing software. The ATN files contain actions recorded by the Photoshop program. These files are created and saved to the Photoshop Actions palette when users create common settings to batch process Photoshop images.
The .atn file extension is also used for extended audio data files, Visual FoxPro WWW search page wizard files and Wild! control panels actions files.
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If you have additional information about the ATN file format or software that uses files with the ATN suffix, please do get in touch - we would love hearing from you.