Dropdown list based on input file

Hello,

I want a drop down list based on an input file in my register form in my Durpal Site.
A drop down list based on list with values isn't a problem, but an option to make a Drop down list based on an input file isn't possible with a standard Drupal Installation.

I have installed the modules Content Profile & content Profile User registration.
Also the Computed field module (cck) is installed.

Is there a drupal module to make drop down lists or other object?

Thanks for help!

Pieter