Differences between shinjitai and simplified characters in the Japanese and Chinese languages exist.
Some of the traditional kanji are not included in the Japanese font of Windows XP/2000, and only rectangles are shown.
Downloading the Meiryo font from the Microsoft website (VistaFont_JPN.EXE) and installing it will solve this problem.
For example, in Japan, 必 is written with the top dot first, while the traditional stroke order writes the 丿 first.
Taiwan, Hong Kong and Macau use traditional characters, though with an altered stroke order.