Adobe Acrobat plugin file
API is a file extension for a plug-in file used by Adobe Acrobat. API stands for Acrobat Plug-In. API files contain information to extend the usability of Adobe Acrobat by adding program features or support for other file formats.
The API file extension is also associated with Lotus 1-2-3 printer driver files.
Learn more about .API files:
Visit the Adobe web page.
Read about Adobe Acrobat at ITKnowledgeExchange.com.