“Distributed with the Japanese version of Windows 3.1 or later, some versions of Internet Explorer 3 Japanese Font Pack, all regions in Windows XP, Microsoft Office v.X to 2004.” [Wikipedia] The font data of v5.0 reads “©2006 data: RICOH Co., Ltd. typeface: RYOBI IMAGIX CO.” See also the proportionally spaced MS Mincho Proportional.