Help! The size limitation of using aviWriter

I am using aviWriter to write a 1.avi file. The problem is there is a limitation on file size. I cannot generate a avi file larger than 4G. My system is Win 7 and the disk format is NTFS.
The core codes is :
AVIWriter aviWriter = new AVIWriter();
Bitmap bt = new Bitmap(....);
aviWriter.AddFrame(bt);
Who can help me to solve this problem. I am recording a video from HD camera, the size will be larger than 4G. How can I do to record a video larger than 4G? EMERGENT!!
The core codes is :
AVIWriter aviWriter = new AVIWriter();
Bitmap bt = new Bitmap(....);
aviWriter.AddFrame(bt);
Who can help me to solve this problem. I am recording a video from HD camera, the size will be larger than 4G. How can I do to record a video larger than 4G? EMERGENT!!