[msi/tests] Fix a test failure on Win9x/WinMe (Try2)

[Paul Vriens]

Hi,

Try2 uses A-functions and uses RegOpenKey as we don't want to create 
keys if not needed.

Applies on top of Hans' series.

Changelog
   Fix a test failure on Win9x/WinMe

-- 
Cheers,

Paul.

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