CreateProcess expects a program and its arguments — not some command for some shell — so ">MyLog.txt" and "2>&1" are being passed to Perl which passes them to your script where you completely ignore them.

What you want is for a cmd shell to execute the string as shell command. That's not gonna happen if you don't run a cmd shell. Executing the following should do the trick: 

cmd /c "...the shell command..."

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You could also do the redirection yourself, thus avoiding having to load a shell. 

use IPC::Open3 qw( open3 );

open(local *TO_CHLD,     '<', 'nul')       or die;
open(local *FR_CHLD,     '>', 'MyLog.txt') or die;
open(local *FR_CHLD_ERR, '>', 'nul')       or die;

my $pid = open3('<TO_CHLD', '>FR_CHLD', '>FR_CHLD_ERR',
   'C:\AS_v5.8.6_Perl\bin\perl.exe',
   'D:\FinancialReports_PerlSource\PDS\output_test.pl',
);

waitpid($pid, 0);  # To wait for child to finish.

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Update: Added alternative.

In reply to Re: Redirecting Output From Command Line in Threads by ikegami
in thread Redirecting Output From Command Line in Threads by CKCJim

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