How to open a .wps file in MS-Word?

I have a bunch of Microsoft Works(.wps) files that need to transfer as a .doc or .docx file. But I don’t know how to properly do this.
A site says I have to download wp6rtf.exe, but I found a trial version only.
This is a converter that enables Microsoft Word to view .wps files. I am using Microsoft Works 4.0 and I will be transferring the files into my Microsoft Word 2007. When I tried converting the file, it looks strange. It seems that the converting process is not successful.
Does anyone knows how to properly format a .wps into .docx? Do I need to run a much higher version of Microsoft Works? I will be using this on my Windows Vista Black Edition 2009, Service Pack 2, 32-Bit OS. I will print the transferred documents through a HP Deskjet D2400 Printer.
If you have a link, on where to download full or premium versions of wp6rtf.exe or if you know different ways to convert this, please let me know. I will highly appreciate it since, I will be using this for my job. I heard about wordconv.exe, it is also a converter, but they said that it will not give you the option to Save As, so please if you know how to do this, send me a reply.
Thank you
