C:\test>dir huge.6.0GB
2008-11-25  09:40     6,442,450,947 huge.6.0GB
               1 File(s)  6,442,450,947 bytes

C:\test>perl -wle"printf qq[%u\n], -s $ARGV[ 0 ]" huge.6.0GB
4294967295

C:\test>perl -wle"printf qq[%.f\n], -s $ARGV[ 0 ]" huge.6.0GB
6442450947