Word versus Word Perfect -- how to change back to WP file

I am setting up a new computer with Windows 7 (from XP). I transferred some Word Perfect files to new computer prior to installing the Word Perfect 11 software. I changed one document to Word, and all of my WP documents changed. Now since I have WP installed, I would like to be able to open original WP documents in that program. I do not see a way to change the files back to WP. Although the files say "WPD File," they open in Word when I attempt to open them. I have tried to "Save As," but do not see the Word Perfect option. Any suggestions will be appreciated. Thanks!

J Mills

Yes. I right-clicked a WP file and under the "File Type", I changed "Open With" to MS Word. This changed all of my WP files. Now it does not give me the option to change it back to Open With Word Perfect.

Ok!! I think I found my solution. Thanks for "listening". :) Part of the issue is me trying to switch from XP to Win 7.