WBK file extension

WordPerfect Workbook Document

File extension: .WBK - WordPerfect is 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.