Archived - Boot Camp 2.0, Mac OS X 10.5: Character issues when keyboard layout/IME is set to Irish in Windows
In Windows XP or Vista, after setting the Regional & Language Options control panel's Standards & Formats setting to "English (Ireland)", the Default Input Language to "English (Ireland) - Irish", and the keyboard layout/IME to "Irish", certain characters may not correspond to the physical layout of a European ISO keyboard (where the € symbol is on the 2 key).
Use the "United Kingdom" keyboard layout/IME instead of Irish.
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