The WordStar Command Emulator only works with Word 97, Word 2000, Word XP (also called Word 2002), Word 2007, Word 2010, and Word 2013 for Windows. See here for a basic emulator for earlier versions of Word for Windows.

Note, that with Word versions that use the "Ribbon" instead of drop-down menus (currently Word 2007, Word 2010 and Word 2013), the WordStar Emulator menus will not be available, but all of the keyboard commands will still work correctly.