Launch Notepad and type in 'Bush hid the facts' then save the file as anything you like. Close it then open it again. If you do this in Windows XP, you probably see some weird Unicode characters or Chinese characters.
The explanation for this bug lies in the Windows function 'IsTextUnicode'. When a text file is encoded in Windows-1252 it is interpreted as UTF-16LE, resulting in the so-called mojibake. It means that Notepad recognizes Unicode characters representing Chinese characters and translates them back into Chinese characters.