Installing Language packages

Hi guys,

I have downloaded the file
"en_fr_de_es_windows_vista_sp2_language_pack_x64_dvd_342425" and when i run
my iso image i get several folders with the differente languages, however
when i go inside every folder i have a Ip.cab file.

My question is how do i add these language packages to my windows vista
control panel?

I've tried Install/ Uninstall display language but it does not show the vcab
file on the Open dialog window. Do i have to do an extra step to install a
specific language file?

Thanks in advance!
Alex