In Wwise 2016.2.3.6077\SDK\samples\SoundEngine\Win32\AkFileHelpers.h
"fileAttributes = GetFileAttributes( in_pszBasePath );" prevents the compilation of this part of the sample in ANSI.
Replacing it by "fileAttributes = GetFileAttributesW( in_pszBasePath );" fixes the problem.
I would fix it because the documentation suggests to use "CAkFilePackageLowLevelIOBlocking g_lowLevelIO;" as a starter and this requires integrating sample/SoundEngine into a user code, which in a lot of cases (most?) will use ANSI instead of wide characters.
Thanks.