Use LibreOffice to Open WPS Files
I’ve found that the best solution is to use LibreOffice, an open source office product. In a lot of ways it is overkill as it is a 300+ MB download and then large install, but it is safe to use and in my experience works fine.
You can just load up your wps files in Libre Office and save as a .docx file or another format of your choosing.
Or look into libwps