Viewer: target Windows 10 and avoid Propsys.lib

XAudio2Create is only exposed inline in xaudio2.h when targeting
_WIN32_WINNT >= 0x0A00, otherwise it's an unresolved import. The MSIX
already requires Windows 10 1809+ so this is consistent.

Also construct PROPVARIANT directly instead of pulling in Propsys.lib
for InitPropVariantFromInt64.

Author: chammoru

Viewer/AudioPlayer.cpp

@@ -1,12 +1,10 @@
 #include "stdafx.h"
 #include "AudioPlayer.h"
 #include <mfapi.h>
-#include <propvarutil.h>
 
 #pragma comment(lib, "mfplat.lib")
 #pragma comment(lib, "mfreadwrite.lib")
 #pragma comment(lib, "mfuuid.lib")
-#pragma comment(lib, "Propsys.lib")
 
 using Microsoft::WRL::ComPtr;
 
@@ -107,10 +105,10 @@ void AudioPlayer::Close()
 
 bool AudioPlayer::SeekReader(double timeSec)
 {
-    PROPVARIANT var;
-    InitPropVariantFromInt64(static_cast<LONGLONG>(timeSec * 1e7), &var); // 100-ns units
+    PROPVARIANT var = {};
+    var.vt = VT_I8;
+    var.hVal.QuadPart = static_cast<LONGLONG>(timeSec * 1e7); // 100-ns units
     HRESULT hr = mReader->SetCurrentPosition(GUID_NULL, var);
-    PropVariantClear(&var);
     return SUCCEEDED(hr);
 }
 

Viewer/targetver.h

@@ -8,12 +8,12 @@
 
 // Modify the following defines if you have to target a platform prior to the ones specified below.
 // Refer to MSDN for the latest info on corresponding values for different platforms.
-#ifndef WINVER          // Minimum required platform: Windows 8 (XAudio2 needs Win8+).
-#define WINVER 0x0602
+#ifndef WINVER          // Minimum required platform: Windows 10 (matches the MSIX target;
+#define WINVER 0x0A00   // gives us the inline XAudio2Create from xaudio2.h).
 #endif
 
 #ifndef _WIN32_WINNT
-#define _WIN32_WINNT 0x0602
+#define _WIN32_WINNT 0x0A00
 #endif
 
 #ifndef _WIN32_WINDOWS        // Specifies that the minimum required platform is Windows 98.