While you're editing script maps, you could also fix a few of the security issues in IIS. For example Code Red worm and $DATA vulnerabilites. Add the following code after the $script_maps{'.plx'} line...

#
#   Protects against $DATA stream hack which gives
#   everyone access to your source code
#
$script_maps{'.pl:$DATA'} = $script_maps{'.pl'};
$script_maps{'.cgi:$DATA'} = $script_maps{'.cgi'};
$script_maps{'.plx:$DATA'} = $script_maps{'.plx'};

#
#   Protects against Code Red Worm by removing
#   the Index Server script mappings
#
delete $script_maps{'.ida'};
delete $script_maps{'.idq'};
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