WM/CAP is a Word macro virus that is designed to infect Word and modify up to five already existing menus and redirecting them to the virus code. WM/CAP may cause some problems, as the names of the modified entries are different in different Word installations and different language versions of Word. Once it is executed, WM/CAP infects documents and deletes all existing macros from them. WM/CAP gets on a system by being attached to template files in Word versions 6 and 7 or any document in Word version 8. Template files can contain text just like a normal document, but they can also hold macros.

Source: http://www.spywareremove.com/removeWMCAP.html