Как определить, есть ли файл на диске
Страница 8. Способ 8 (CreateFile)

 
#include <windows.h>

bool FileExists (LPCTSTR fname)

{

    HANDLE hFile = ::CreateFile(

        fname,                                              // file (or device) name

        0,                                                  // query access only

        FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, // share mode

        NULL,                                               // security attributes

        OPEN_EXISTING,                                      // disposition

        FILE_FLAG_NO_BUFFERING | FILE_FLAG_SEQUENTIAL_SCAN, // flags & attributes

        NULL                                                // template file

        );

    if (INVALID_HANDLE_VALUE != hFile) {

        ::CloseHandle(hFile);

        return true;

    }

    return false;

}