How to type Unicode characters in Windows (from Wikipedia):
In Microsoft Windows
A prerequisite for this input method is that the registry key "HKEY_CURRENT_USER\Control Panel\Input Method" contains a string type (REG_SZ) value called "EnableHexNumpad", which has the value data 1. Users need to log off/in on Windows 8.1/8.0, Windows 7, and Vista or reboot on earlier systems after editing the registry for this input method to start working. Unicode characters can be entered by holding down Alt, pressing the + on the numeric keypad, followed by the hex code - using the numeric keypad for digits from 0 to 9 and letter keys for A to F digits - and then releasing Alt.
The RichEdit control on Microsoft Windows (as used in for example WordPad) supports the following input method: one first enters the character’s hexadecimal code (between two and six hexadecimal digits), then immediately presses Alt+x. For example, entering f1 and then pressing the combination will produce the character ñ. Unless it is six hexadecimal digits long, the code must not be preceded by any digit or letters a–f as they will be treated as part of the code to be converted. For example, entering af1 followed by Alt+x will produce ૱ (U+0AF1), but entering a0000f1 followed by Alt+x will produce a ñ. This also works in Microsoft Word 2002/2003 for Windows.