do a google search or go to download.com for movie spliters. i'm not sure but i dont think you can convert divx to much just because of the way it is compressed. and personaly i dont think you want to because a 1400mb movie in divx could be more then twice that in avi. you would end up with something like 3000mb.

I think the program tng-something (i forgot full name) will do what you want

http://www.imagespro.com/programs/2198/