OpenOffice will open WordPerfect files, regardless of their extension. Quick Look will allow you to preview .wpd files, as long as you have the WordPerfect.qlgenerator package installed in /Library/Quicklook. However, one cannot Quick Look Wordperfect files with other extensions, such as .frm, which is a name given to Wordperfect form files.
In order to make Quick Look recognize the .frm file type, control-click on the OpenOffice.org.app and select Show Package Contents from the pop-up menu. In the Contents folder, double-click the Info.plist file (assuming you have XCode installed). Add a new child under the Exported Type UTIs key. Enter the following information (some of the keys will be there by default, others you will need to enter manually):
<dict> <key>UTTypeConformsTo</key> <array> <string>com.corel.wordperfect.doc</string> </array> <key>UTTypeIdentifier</key> <string>com.corel.wordperfect.frm</string> <key>UTTypeTagSpecification</key> <dict> <key>public.mime-type</key> <array> <string>application/vnd.sun.xml.writer</string> </array> <key>public.filename-extension</key> <array> <string>frm</string> </array> </dict> </dict>
Mac OS X Hints
http://hints.macworld.com/article.php?story=20100119080106292