I wonder if your problem might be IN WP4_utility.pl at 7 and 8:

my $ligne_number=0;  
my $analyse_file=0;

[download]

which are never seen again.

But, re your surmise about the call in the parent, you have an inexplicable (to me, anyway) chdir in the last line you've supplied. Did you perhaps try to create a minimal test case, and exclude something important? And have you considered turning the child into a module to enable use of the child without resort to Windows' CMD?

In reply to Re: results printing error by ww
in thread results printing error by steph_bow

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