What is KEY? What Opens a KEY? File Format List from WhatIs.com

File Extension

KEY File Format

Security file (Such as a software registration number)

KEY file format icon

KEY is a file extension for a security file format used by a program to store a license, encryption, registration or security code. KEY files are generally created in the program folder upon registration.

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This was last updated in July 2010
Editorial Director Margaret Rouse

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