Why publish PDF to flipbook with 3DP format? 1. This is an effective solution to send 3DP flipbook as attachment via email instead of attaching EXE flipbook in an email! As we can find on the flipbook market, EXE flipbook formats are the most familiar output type for eBook. However, have you ever tried to attach a .exe file to an email and send it to someone? If so, you were probably a little disappointed - most email programs won't allow you send EXE via email since a consideration of security risk. Executable files can contain viruses and malware. And EXE file is a kind of Executable file and most email software programs and online email services restrict or block the sending and receiving of these attachments. 3DP technology will be a new solution instead of EXE for email sharing! You have no need to worry about the security risk and whether it can send via email or not! 2. What's more, when you publish 3D flash page flip book with 3DP format in 3D PageFlip software, you will get the output eBook with smallest file size!