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Geting the file size of a system application on windows in C++

I am trying to get the file size of a system application on windows. To test this i have created a test application that tries to get the file size of smss.exe in C:WindowsSystem32smss.exe but it fails with error: ERROR_FILE_NOT_FOUND. The file does actually exist (i have checked). I've also tried different methods for getting the file size, with: FindFirstFile, CreateFile and GetFileSizeEx. But all return the same error. I would also like to read the file contents.

What am i doing wrong?

The code:

// Test.cpp : Defines the entry point for the console application.
//

#include 'stdafx.h'

#include <windows.h>
#include <stdio.h>
#include <tchar.h>
#include <iostream>

__int64 getFileSize(LPWSTR filePath)
{
WIN32_FILE_ATTRIBUTE_DATA fad;
if (!GetFileAttributesEx(filePath, GetFileExInfoStandard, &fad))
{
_tprintf(TEXT(' CAnt get file size for file %s error %d'), filePath, GetLastError());
return 0;
}
LARGE_INTEGER size;
size.HighPart = fad.nFileSizeHigh;
size.LowPart = fad.nFileSizeLow;
return size.QuadPart;
}

int _tmain(int argc, _TCHAR* argv[])
{
_tprintf(TEXT('File size %d '), getFileSize(L'C:\Windows\System32\smss.exe'));
}

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