[Zope] Upload file to server for encoding...

[Nick Gr]

Hello Zope community,

I just installed  Zope-2.9.4 in a windows XP SP2 . I'm making a web site 
that the visitors should:

A) Upload a file to the server

B)After the file is uploaded , I have write a python program to encode 
the file

C)When the encoding is finish, user must download the file back to his 
machine.

I'm very new to Zope and I choose it because I thought it should have an 
easy and good communication with python. Since I have terminated the 
python program that does what I want, I have no idea how to accomplish 
the requests above.
 
A -> I know I will need external access to the file system, is there a 
product that can help me in that ?

B -> my program works as I want like a python program , it will need any 
modification so I can use it in Zope ?

C -> I think I will need also some kind of progress indicator so the 
user can know when the encoding is done (some time takes more than a 
minute). Any ideas how the user will download back the file? should the 
download begin automatically after the encoding ?

Thanks in advance...