WordPerfect was the top selling word processing software during the 1980's and early 1990's, and retains a big fanclub to this day (so much so that it was still the second most popular office suite up to a couple of years ago).
Development of the DOS and Macintosh versions of WordPerfect were stopped in 1997 but the Windows version is still under active development by current owners Corel. It is a historically popular word processing file format, which can also be opened by most versions of Microsoft Word. WPD is a text document file format created by Satellite Systems International for their WordPerfect word processing software in 1980.
