Invalid handle error from ReadFileEx using valid handle from CreateFile - c++

Question

The problem I'm having: CreateFile returns a handle of 0x194. ReadFileEx is saying that this handle is invalid. (Error 6.) Any ideas? The argument passed in is "C:\testfile.txt", which is a valid text file I made in Notepad. Despite being a C++ programmer for the last 12 years, this is my first time writing anything with "windows.h" or threads.
#include "stdafx.h"
#include "stdio.h"
#include "windows.h"
using namespace System;
int main(int argc, char **argv)
{
if (argc != 2)
{
printf("To display a file, you must enter the filename as the only command argument.");
scanf("\n");
return 0;
}
HANDLE file;
int nameLen = (strlen(argv[1]) + 1);
wchar_t *filename = new wchar_t[nameLen];
if (filename == 0)
{
printf("To display a file, you must enter the filename as the only command argument.");
scanf("\n");
return 0;
}
memset(filename, 0, nameLen);
::MultiByteToWideChar(CP_ACP, NULL, argv[1], -1, filename, nameLen);
file = CreateFile(filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (file == NULL)
{
printf("A valid filename is required.");
scanf("\n");
return 0;
}
char *buffer;
buffer = new char[1024];
OVERLAPPED overlapped;
overlapped.Offset = overlapped.OffsetHigh = 0;
ReadFileEx(file, &buffer, 1024, &overlapped, NULL);
WaitForSingleObject(&file, 0);
if (GetLastError() != ERROR_SUCCESS)
{
printf("A valid file is required., Error: %d", GetLastError());
scanf("\n");
return 0;
}
printf("%s", buffer);
scanf("\n");
delete buffer;
return 0;
}

Answer 1

My guess is to change
ReadFileEx(&file, &buffer, 1024, &overlapped, NULL);
to
ReadFileEx(file, &buffer, 1024, &overlapped, NULL);