[MiKTeX] Writing Problem

[Rodrigo R. S. <sum...@gm...>]

Hi all,

I upgraded to the latest version of Miktex, so I can use the write18 
command to execute makeindex in several indices.
However, each time the i run latex the files with the raw data of 
indices are created again.
What causes makeindex to always find empty files.

Regards,

Rodrigo