A question about Table in Cell

Document doc = new Document("exam.doc");
DocumentBuilder builder = new DocumentBuilder(doc);
builder.MoveToCell(1,0,0,0);
builder.insertCell();
builder.writeln("test"):
doc.Save();

when I use office 2003 to open it. everything is OK.
but the OS breaks down when i open it with office 2000.

WHY? thanks

Please attach the problem document here. I'll check what could be done.