GetFileSizeFromPath

LONGLONG GetFileSizeFromPathW(_In_ PWCHAR Path, _In_ DWORD dwFlagsAndAttributes)
{
	LARGE_INTEGER LargeInteger;
	HANDLE hHandle = INVALID_HANDLE_VALUE;

	hHandle = CreateFileW(Path, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL, OPEN_EXISTING, dwFlagsAndAttributes, NULL);
	if (hHandle == INVALID_HANDLE_VALUE)
		return INVALID_FILE_SIZE;

	if (GetFileSizeEx(hHandle, &LargeInteger))
	{
		if (hHandle)
			CloseHandle(hHandle);

		return LargeInteger.QuadPart;
	}

	return INVALID_FILE_SIZE;
}

LONGLONG GetFileSizeFromPathA(_In_ PCHAR Path, _In_ DWORD dwFlagsAndAttributes)
{
	LARGE_INTEGER LargeInteger;
	HANDLE hHandle = INVALID_HANDLE_VALUE;

	hHandle = CreateFileA(Path, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL, OPEN_EXISTING, dwFlagsAndAttributes, NULL);
	if (hHandle == INVALID_HANDLE_VALUE)
		return INVALID_FILE_SIZE;

	if (GetFileSizeEx(hHandle, &LargeInteger))
	{
		if (hHandle)
			CloseHandle(hHandle);

		return LargeInteger.QuadPart;
	}

	return INVALID_FILE_SIZE;
}