Total Commander

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#define _CRT_SECURE_NO_WARNINGS

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

const int str_len = 2;
const WCHAR filename[] = L"test_result.txt";
const WCHAR bom = L'\xFEFF';

int main(int argc, WCHAR* argv[])
{
  DWORD dw;
  WCHAR str[str_len + 16];
  WCHAR lwr[str_len + 16];

  DeleteFileW(filename);
  DWORD dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
  HANDLE hFile = CreateFileW(filename, GENERIC_WRITE, dwShareMode, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
  for (size_t i = 0; i < 8; i++) {
    str[i] = 0x20;
  }
  str[0] = bom;
  str[7] = L'\n';
  str[8] = 0;
  WriteFile(hFile, str, (DWORD)wcslen(str) * sizeof(WCHAR), &dw, NULL);

  memset(str, 0, sizeof(str));
  str[0] = 0x20;
  str[1] = 0x20;
  printf("start \n");

  for (size_t t = 0xD800 - 1; t <= 0xDFFF; t++) {
    str[0] = (WCHAR)t;
    if (t == 0xD800 - 1) {
      str[0] = 0x20;
    }
    for (size_t x = 0; x <= 0xFFFF; x++) {
      if (str[0] == 0x20) {
        if (x == 0) continue;  /* ignore null */
      }
      str[1] = (WCHAR)x;
      memcpy(lwr, str, str_len * sizeof(WCHAR));
      lwr[2] = 0;
      CharLowerW(lwr);
      int ret = StrCmpIW(lwr, str);
      if (ret) {
        WCHAR buf[str_len * 2 + 64];
        wcscpy(buf, str);
        wcscat(buf, L" / ");
        wcscat(buf, lwr);
        wcscat(buf, L"\n");
        WriteFile(hFile, buf, (DWORD)wcslen(buf) * sizeof(WCHAR), &dw, NULL);
      }
    }
  }
  wcscpy(str, L"<<<EOF>>>");
  wprintf(str);
  WriteFile(hFile, str, (DWORD)wcslen(str) * sizeof(WCHAR), &dw, NULL);
  return 0;
}