.BK9 File Extension

WordPerfect 9th Timed backup file for document window

The .BK9 extension is used by WordPerfect, a word processing program; at the height of its popularity in the late 1980s and early 1990s, it was the de facto standard word processor, but has since been eclipsed in sales by Microsoft Word.

Although the MS-DOS and Windows versions are best known, it has been available for a wide variety of computers and operating systems, including Mac OS, Linux, Apple II, most popular versions of Unix, VMS, Data General, System/370, AmigaOS, and Atari ST.

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