..wps, if I recall correctly, is the extension typically associated with
documents created in MS Works, is it not? If that's not it, of course, you
probably need to identify which application did create it.
In any case, what you'll need to do is find a converter that will work
against this document and use it to convert the document to something else,
like MS Word format, from which you can then generate a PDF file.
Inasmuch as this forum is intended to provide support for MS Access, the
database program which is part of MS Office, you might want to re-post this
question in a forum which supports your software, (e.g. MS Works).
George