errors like these about 200 errors: debug\excel.tlh(1150) : error C2371: 'FontPtr' : redefinition; different basic types debug\excel.tlh(1228) : error C2786: 'BOOL (__stdcall *)(HDC,int,int,int,int)' : invalid operand for __uuidof debug\excel.tlh(1228) : error C2923: '_com_IIID' : 'Rectangle' is not a valid template type argument for parameter '_Interface'