Recent versions of Microsoft Word/Mac can't open WordPerfect
documents.
However, there are a bunch of ways to convert a WordPerfect document
to a MS Word document on your Macintosh. Here are the two most
popular ways:
1-Purchase MacLinkPlus from DataViz
http://www.dataviz.com/products/maclinkplus/index.html
and use it to convert your .wpd files to .doc files for use in
Microsoft Word. This, at first, might seem like the ideal solution,
but in practice, if your documents have complex formatting, the
MacLinkPlus translators can be disappointing.
2/3-Download AbiWord (free)
http://www.abisource.com/
or
NeoOffice (free)
http://www.neooffice.org/neojava/en/index.php
and use one of them to open your documents and save them as .doc files
for use in Word (or continue using AbiWord or NeoOffice as your main
word processing application). Both of these programs use the same
exact translators, so it doesn't matter which you use.
I can send a long list of other options to whomever wants it.