Old Adobe PageMaker does not support Microsoft Word formats, so even if you have access to the program a direct pm5 to word conversion, aka to doc or docx is unlikely. Nonetheless PageMaker can export its own document to RTF format. These Rich Text documents can then be imported to Microsoft Word, or similar word processor and saved in DOC/DOCX format. Only the text will be converted however, special effects from PageMaker will not.
In any case, you will need PageMaker. Without it, any attempts to convert pm5 to word will be futile.Open PM5 file Open WORD file