Did anyone ever make one? I've got Word 5.1 on the PowerBook 180c and would love to have something that could read my MWPro files.

The date on 5.1 is November 4, 1992, right about when MacWrite Pro was (finally) making its debut. Perhaps Microsoft issued a translator in 1993 before Word 6 came out? (5.1 does read MacWrite II files).