.API File Extension
File Type 1Adobe Photoshop Inks File
What is an API file?
Settings file used by Photoshop, a raster graphics editing program; stores color settings for ink colors that are used for printing images; enables users to save and load calibrated color settings, which is useful when establishing printing properties for a specific inkjet or laser printer.
File Type 2Acrobat Plug-in
.API File Association 2
Adds additional features or support for other formats to Adobe Acrobat.