This article explains the different file formats that use the WPD file extension. It also explains how to open and convert each type.
How to Open a WPEntrust File: How to Open Different File Types
A file with the .WPD extension is a text document. What type of text file it is depends on the program that uses it; there are three main file formats that use this file extension.
The most likely scenario is that you have a document that was created by Corel's WordPerfect application. It may contain tables, text, images, and other objects stored in the file.
The Swiftpage Act! contact management software (formerly known as Sage ACT!) also uses WPD files and will most likely consist of text only (no images or other objects).
