I get the following running your code Henriques

E:\Download\KiX\KiX2010.464b1>KIX32 T1.KIX

4.64
7601
E:\Download\KiX\KiX2010.464b1
4.64

7601
E:\Download\KiX\KiX2010.464b1
4.64

piet
klaas
jan
joris
ERROR : Error in expression: this type of array not supported in expressions.!
Script: E:\Download\KiX\KiX2010.464b1\T1.KIX
Line : 35


This is on line 35
 Code:
$RESULT = Len($PIET)