Somoene send me an email telling me that there’s some problem with the file. I have updated the link and now the source can be downloaded.
I guess this pageflip program is the most popular one within my site since I always receive emails asking me how to do that effect. I once said I may post a tutorial here on my way of doing that, but I am too busy to do so recently
I hope the fla will do some help (but as I remmeber, the code is quite messy. Sorry about that.)