[imp] Imp file attach problem

[horde-help at dglnet.com.br]

Hello All,

I appreciate if anyone could help me.

On Horde/Imp system when I receive an email with MS-WORD or MS-EXCEL file
attached I cannot read the email.

I can see the email on In Box, however if I click on email an empty white
screen appears and nothing happens.

With another file extensions the error doesn´t happen.

I already tried modify the files without success, inserting and deleting
the msword/msexcel lines on files below:
/etc/psa-horde/horde/mime_drivers.php
/etc/psa-horde/imp/mime_drivers.php
/etc/psa-horde/horde/mime_drivers.php
/etc/httpd/conf/magic

I forgot an important information:
The Horde/imp system is running on Plesk v7.5.4 system on Virtuozzo
environment

Please, I will be glad if anyone could help me.

Best regards,

Rodrigo