(I also asked this on StackOverflow -
http://stackoverflow.com/questions/16422812/ironpython-always-in-32-bit-
mode-on-64bit-machine-even-when-running-ipy64-exe - have copy pasted
from there).
I am sure I am missing something simple but unfortunately a lot
of searching hasn't thrown up
Can you use corflags.exe to confirm that your ipy64.exe is actually not
marked for 32-bit execution? Your output should look like this:
PS D:\Program Files\Sho\bin> corflags .\ipy64.exe
Microsoft (R) .NET Framework CorFlags Conversion Tool. Version 3.5.30729.1
Copyright (c) Microsoft Corporation