If you mean the exit code of the executable, then you need to print $? >> 8 if the return value from system is non-zero 

system( 'perl -e"exit( 123 )"' )  and print $? >> 8;
123

## or 

system( $command ) == 0 or die 'Failed with: ', $? >> 8;

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In reply to Re: Calling Windows Executable from script by BrowserUk
in thread Calling Windows Executable from script by dtharby

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