The problem is that when you try to open the files you are not in $Start_dir so you have to prepend that to the file name like: 
open FILEOPENED, "$Start_dir/$a" or die "couldn't open the file   $!"

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In reply to Re^3: using filehandle to open files listed in array by jwkrahn
in thread using filehandle to open files listed in array by richill

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