

The data in the file generally consists of plain text, but the license key information within is encrypted. It is used for successfully authenticating the paid versions of the software.

Although KEY files can only be directly opened on devices running on macOS/iOS operating systems, Apple also offers the Keynote software on its browser-based platform called iCloud. The KEY presentation files can consist of a collection of text, pictures, charts, tables, graphics, audio, video, transitions, notes along with the XML data that is needed for playing the presentation. It uses the KEY file to save presentations. Main Use: Apple Keynote application is developed for macOS and iOS platforms.KEY file extension is used to save data files in the Keynote application developed by Apple as a part of its office application suite iWork.

KEY files mostly belong to Keynote by Apple Inc.
