WordPerfect used to dominate the computer word processors. However, it is not as popular today, but occasionally you may receive an attachment in WordPerfect format and need to open it. To do so, you need a WordPerfect viewer program. Here are two:
The other option is to have the sender save the document as a RTF (Rich Text Format) document before sending.
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Another option is to have the sender save as a Word document and send it. I can change my Word Perfect to Word but a Word can not do the reverse.