mmdevapi/tests: Use RegQueryValueExW() for compatibility with Windows XP.

Francois Gouget fgouget at
Wed Apr 20 15:17:49 CDT 2016

On Wed, 20 Apr 2016, Andrew Eikum wrote:

> mmdevapi doesn't exist on winxp. I'm not opposed to this change, but
> does it matter?

It fixes this failure:

Arguably the TestBot should have realized that mmdevapi is missing and 
skipped running the test altogether. But in the meantime this means 
further mmdevapi patches will not return spurious failures.

Francois Gouget <fgouget at>    
In theory, theory and practice are the same, but in practice they're different.

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