A KEY file is a generic file extension used by various programs when registering legal copies of the software. It may be saved in a plain text format but generally contains some form of encrypted key string that authenticates the purchase and registers the software.
![File File](/uploads/1/2/4/8/124845725/308578333.jpg)
File Viewer Plus is an advanced file viewer and converter that opens over 300 types of files, including Microsoft Office documents, PDFs, images, camera raws, audio and video files, compressed archives, and more. The software also displays file properties and hidden metadata for each file you open.
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