Module development and code questions

Why does upload.modules save in .txt?

for exemple, whe i try attach some file with upload.module it saves the file in .txt.
I'm trying attach a *.mtf file and i set in settings the file extension... but when i hit down the attach button it come back with "name.mtf.txt"

why?? may anyone help me? pleease!!

Greetings,
When new versions of category.module (or other modules) are updated is it just a matter of overwriting the files in the modules folder? I've read a couple of threads on 4.7 that the database will not be affected once the official version is released.
Mil gracias,
lsabug

I'm saving and retrieving custom fields with the user information, but not using the profile module. So I've written the hook_user() function in my module and I can enter these new fields at registration of a new user and edit the account. I wrote my own load and save functions and everything loads and saves. Life is great.

One thing I miss in Drupal is a staging/testing function, to check new versions, modules, templates etc before putting it on the live server. So I'll try to write a module for this.

[First question: is someone already working on this?]

I'll give a outline of my plans here, hoping to get weak parts critizised and some questions answered.

Functionality of the module will be inspired by the method described in http://drupal.org/creating-drupal-test-sites

I want to be able to not only upload one image but multiple images with the same post.

Hi,

As far as i can understand about the menu iteam's visibility to a particular user, when user has permission to visit that page and it is enabled by admin, then only it is showed in menu iteam unless otherwise it is not.
But what about if i want certain menu iteams to show only to authenticated users and not to anonymous users, evenif both has permission to see the page which that menu iteam crosspond to. And to generalise this problem, what about making menu iteam visibility based on "roles".

--rafi