Onishin a member of the Logic Sunrise forum, has released a modified version of jjolano’s OpenPS3FTP, it splits files larger than 4GB, for easy transfer, here is a quote from the source(Translated thanks to Jack_Bauer_the_frog):
Onishin, a member and developper of our forum (Logic Sunrise), delivers to us today his nice homebrew called OpenPS3FTPsplit, a modded version of OpenPS3FTP 2.3′s source code, the famous FTP server designed by jjolano. This programme has a brand-new and very useful feature: it splits files larger than 4Go during FTP transfer. Meaning that if you want to transfer one such file to the internal HDD of your PS3, or to a FAT32 external HDD plugged to it, you just need to launch the copy and the software will automatically fragment the file.
Read more: http://www.ps3hax.net/showthread.php?t=30196#ixzz1dosxk6Re