4 files changed, 3 insertions, 34 deletions
diff --git a/src/os/windows/win32.cpp b/src/os/windows/win32.cpp
index 3ed0cdb2a..4478caa65 100644
--- a/src/os/windows/win32.cpp
+++ b/src/os/windows/win32.cpp
@@ -707,38 +707,6 @@ int OTTDStringCompare(const char *s1, const char *s2)
 	return CompareString(MAKELCID(_current_language->winlangid, SORT_DEFAULT), NORM_IGNORECASE, s1_buf, -1, s2_buf, -1);
 }
 
-/**
- * Is the current Windows version Vista or later?
- * @return True if the current Windows is Vista or later.
- */
-bool IsWindowsVistaOrGreater()
-{
-	typedef BOOL (WINAPI * LPVERIFYVERSIONINFO)(LPOSVERSIONINFOEX, DWORD, DWORDLONG);
-	typedef ULONGLONG (NTAPI * LPVERSETCONDITIONMASK)(ULONGLONG, DWORD, BYTE);
-#ifdef UNICODE
-	static LPVERIFYVERSIONINFO _VerifyVersionInfo = (LPVERIFYVERSIONINFO)GetProcAddress(GetModuleHandle(_T("Kernel32")), "VerifyVersionInfoW");
-#else
-	static LPVERIFYVERSIONINFO _VerifyVersionInfo = (LPVERIFYVERSIONINFO)GetProcAddress(GetModuleHandle(_T("Kernel32")), "VerifyVersionInfoA");
-#endif
-	static LPVERSETCONDITIONMASK _VerSetConditionMask = (LPVERSETCONDITIONMASK)GetProcAddress(GetModuleHandle(_T("Kernel32")), "VerSetConditionMask");
-
-	if (_VerifyVersionInfo != nullptr && _VerSetConditionMask != nullptr) {
-		OSVERSIONINFOEX osvi = { sizeof(osvi), 0, 0, 0, 0, {0}, 0, 0 };
-		DWORDLONG dwlConditionMask = 0;
-		dwlConditionMask = _VerSetConditionMask(dwlConditionMask, VER_MAJORVERSION, VER_GREATER_EQUAL);
-		dwlConditionMask = _VerSetConditionMask(dwlConditionMask, VER_MINORVERSION, VER_GREATER_EQUAL);
-		dwlConditionMask = _VerSetConditionMask(dwlConditionMask, VER_SERVICEPACKMAJOR, VER_GREATER_EQUAL);
-
-		osvi.dwMajorVersion = 6;
-		osvi.dwMinorVersion = 0;
-		osvi.wServicePackMajor = 0;
-
-		return _VerifyVersionInfo(&osvi, VER_MAJORVERSION | VER_MINORVERSION | VER_SERVICEPACKMAJOR, dwlConditionMask) != FALSE;
-	} else {
-		return LOBYTE(GetVersion()) >= 6;
-	}
-}
-
 #ifdef _MSC_VER
 /* Based on code from MSDN: https://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx */
 const DWORD MS_VC_EXCEPTION = 0x406D1388;
diff --git a/src/os/windows/win32.h b/src/os/windows/win32.h
index 095181c46..b2048375b 100644
--- a/src/os/windows/win32.h
+++ b/src/os/windows/win32.h
@@ -25,6 +25,5 @@ wchar_t *convert_to_fs(const char *name, wchar_t *utf16_buf, size_t buflen);
 
 void Win32SetCurrentLocaleName(const char *iso_code);
 int OTTDStringCompare(const char *s1, const char *s2);
-bool IsWindowsVistaOrGreater();
 
 #endif /* WIN32_H */
diff --git a/src/sound/win32_s.cpp b/src/sound/win32_s.cpp
index eccbb4f42..87959e586 100644
--- a/src/sound/win32_s.cpp
+++ b/src/sound/win32_s.cpp
@@ -17,6 +17,7 @@
 #include "win32_s.h"
 #include <windows.h>
 #include <mmsystem.h>
+#include <versionhelpers.h>
 #include "../os/windows/win32.h"
 #include "../thread.h"
 
@@ -69,7 +70,7 @@ const char *SoundDriver_Win32::Start(const StringList &parm)
 	wfex.nAvgBytesPerSec = wfex.nSamplesPerSec * wfex.nBlockAlign;
 
 	/* Limit buffer size to prevent overflows. */
-	_bufsize = GetDriverParamInt(parm, "bufsize", (GB(GetVersion(), 0, 8) > 5) ? 8192 : 4096);
+	_bufsize = GetDriverParamInt(parm, "bufsize", IsWindowsVistaOrGreater() ? 8192 : 4096);
 	_bufsize = std::min<int>(_bufsize, UINT16_MAX);
 
 	try {
diff --git a/src/video/win32_v.cpp b/src/video/win32_v.cpp
index f0291db71..7dfc0034a 100644
--- a/src/video/win32_v.cpp
+++ b/src/video/win32_v.cpp
@@ -25,6 +25,7 @@
 #include "win32_v.h"
 #include <windows.h>
 #include <imm.h>
+#include <versionhelpers.h>
 
 #include "../safeguards.h"