Hi,
I had this problem too, and i solved it by creating a table of (1 row x 1 column) in that which i inserted the bitmap image. Then you can move the table with your image where you want, because now the image is not a floating object.
Here are the 3 lines that do all the job
WordRpt_AddTable (docHandle, 1, 1, &tableHandle);
WordRpt_GoToCell (tableHandle, 1, 1);
WordRpt_InsertImageInCell (tableHandle, imageFileName, &bitmapID);
How you can see this solution is very simple, and works very fine.
Regards
Eduardo