How to check for $ProgramFiles(x86) ?

Hello

I am trying to see if the current system is 32-bit or 64-bit Windows. On
64-bit Windows the environment variable $ProgramFiles(x86) is known to
exits, but Vim will just check for $ProgramFiles and the appendthe
'(x86)' part. Is there a way to check if the environment variable
$ProgramFiles(x86) exists in the current environment ?

I tried both expand('$ProgramFiles(x86)') and
exists('$ProgramFiles(x86)'), both of them check the '$ProgamFiles' part
only.

Thank you,
Timothy Madden

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