BMP extraction from video with Vfw.h - compatibility

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Windows

Win7

video

frame

BMP

Hi all,
I'm tring to develop a SW that extracts single bmp frames from a video file encoded with 3ivx codec. I must use vfw interfaces...
First of all I'have installed 3ivx decoder (3ivx_MPEG-4_504) and check that with "mediaplayer classic" video is played correctly. Im'm working on win8.1 64bit machine - Vs2010 c++.
Then if I run my SW (w32 app) with "Administrator Privileges" or in "compatibility mode" works; otherwise, if run it with normal privileges and with no compatibility function, "AVIStreamGetFrameOpen" always returns NULL.
Searching on the web i found a lot of possible configuration, almost all of them works correctly with compatibilty mode but not without.
If I run the SW in WIN_XP everything works.

Follows an extract of the source code:

PGETFRAME m_pFrame;
	PAVIFILE  m_Avi;
	PAVISTREAM m_pStream;
	bool m_bAviLibInitialized;
	bool m_bAviFileOpened;
	unsigned int m_nSize;


	AVIFileInit();
	
	
    int res=AVIFileOpen(&m_Avi, szFileName, OF_READ, NULL);

    
	
    AVIFILEINFO avi_info;
    AVIFileInfo(m_Avi, &avi_info, sizeof(AVIFILEINFO));

    res=AVIFileGetStream(m_Avi, &m_pStream, streamtypeVIDEO /*video stream*/, 
                                               0 /*first stream*/);


    //do some task with the stream
    int iNumFrames;
    int iFirstFrame;

    iFirstFrame=AVIStreamStart(m_pStream);
    if (iFirstFrame==-1)
    {
        //Error getteing the frame inside the stream

        if (m_pStream!=NULL)
            AVIStreamRelease(m_pStream);

        AVIFileExit();
		
        return FALSE;
    }

    iNumFrames=AVIStreamLength(m_pStream);
    if (iNumFrames==-1)
    {
        //Error getteing the number of frames inside the stream
        
        if (m_pStream!=NULL)
            AVIStreamRelease(m_pStream);
        
        AVIFileExit();
		
        return FALSE;
    }

    //getting bitmap from frame
   BITMAPINFOHEADER bih;
    ZeroMemory(&bih, sizeof(BITMAPINFOHEADER));

    bih.biBitCount=24;    //24 bit per pixel
    bih.biClrImportant=0;
    bih.biClrUsed = 0;
    bih.biCompression = BI_RGB;
    bih.biPlanes = 1;
    bih.biSize = 40;
    bih.biXPelsPerMeter = 0;
    bih.biYPelsPerMeter = 0;
    //calculate total size of RGBQUAD scanlines (DWORD aligned)
    bih.biSizeImage = (((bih.biWidth * 3) + 3) & 0xFFFC) * bih.biHeight;

   AVIStreamStart(m_pStream);

   m_pFrame=AVIStreamGetFrameOpen(m_pStream, &bih);
 
   if (m_pFrame == NULL)
   {
	   AfxMessageBox(_T("Unable to Open Video File"),MB_ICONERROR | MB_OK);
   }

I also try to call AVIStreamGetFrameOpen with following parameters:

m_pFrame=AVIStreamGetFrameOpen(m_pStream, NULL);
m_pFrame=AVIStreamGetFrameOpen(m_pStream, (BITMAPINFOHEADER*) AVIGETFRAMEF_BESTDISPLAYFMT);

Thanks in advance for any suggestion!