[jdmichal]

Windows alt-codes -- Hold down alt, then hit the number combination on the num-pad, then release alt:

    Å - 0197
    å - 0229
    Ä - 0196
    ä - 0228
    Ö - 0214
    ö - 0246

From http://fsymbols.com/keyboard/windows/alt-codes/list/