[TYPO3-english] formhandler: pre-loading values from file

[Claudio Strizzolo]

Hi all,
I am trying to update a mailformplus setup to formhandler.
I need to load the values to be used in a <select> form field from a text 
file:

Donald|Donald.Duck at example.com
Mickey|Mickey.Mouse at example.com

Basically, I need the first field to appear in the select menu, and the 
sedcond field to be assigned as the value.

In mailformplus a preprocUserFunc was used:

plugin.tx_thmailformplus_pi1.preprocUserFunc = fileadmin/somewhere/
my_preproc.php:my_preproc->doit

How can I do the same using formhandler? I read about the 
Preprocessor_LoadDB preprocessor, but that is a different case (DB instead 
of text file).

Any hints?

Thanks in advance,

Claudio