WP5, WordPerfect 5 Document (.wp5)
The WP5 Document file format
The WP5 file extension has been assigned to documents created using Corel's WordPerfect 5.x, a highly successful version of the popular word processing software for usage in DOS.
Technical details of WP5 files
Documents saved in the WP5 format can contain text and basic formatting. Furthermore, they support tables within the document. The files can, nowadays, still be opened, viewed and edited in WordPerfect for Windows.