The WPS extension belongs to Microsoft Works, a once-popular word processing program no longer in common use. If you have old Microsoft Works files that you wish to open, you can convert them to ODT format, used by the free word processing program OpenOffice. The easiest way is to open the WPS file in Microsoft Works, save it as an RTF (Rich Text Format) file, open that file in OpenOffice and save it again in ODT format. If you don't have Microsoft Works anymore, there are several other free conversion methods.
Convert the WPS file to DOC (Microsoft Word) or RTF using Zamzar, a free online file converter (see Resources).
Open the converted DOC or RTF with OpenOffice.
Go to “File->Save As.” Under “Save As Type,” choose “ODF Text Document (.odt)” and click “Save.”
Download and install Word Viewer, a free program which allows you to view, print and copy Microsoft Word and Microsoft Works documents (but not save them), even if you don't have those programs installed.
Open the WPS file with Word Viewer and copy the text.
Paste the text into a new OpenOffice text document and adjust the formatting as necessary.
Save the document in ODT format.
Download a variant of OpenOffice that can open WPS files. These variants include Oxygen Office Professional, NeoOffice and Your Open Office.
Uninstall OpenOffice if you already have it installed, then install the variant program.
Open the WPS file with the OpenOffice variant and save it as an ODT file.