[PATCH] shlwapi: Properly handle pszExtra in IQueryAssociations_GetString.

[Lei Zhang]

Hi,

In IQueryAssociations_GetString, if pszExtra is NULL, then we should
figure out its value from the default value of
HKEY_CLASSES_ROOT\filetype\shell. If the default value is
non-existent, then we should use the first available subkey.

This patch adds a test for this and implements this functionality.
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