Is there any way to access the "raw" command-line in order to catch quoting and escaping?

The first google result for "windows api get command line" is GetCommandLineA. So I hunted on CPAN and thanks to Win32::API's samples I got:

use warnings;
use strict;

use feature 'state';
use Win32::API;
sub GetCommandLine {
    state $GetCommandLine = Win32::API->new("kernel32", "GetCommandLin
+e", [], 'P');
    ( my $c = pack("a1024", $GetCommandLine->Call()) ) =~ s/\0*$//;
    return $c;
}

use Data::Dumper;
$Data::Dumper::Useqq=1;

my $cmdline = GetCommandLine();
print Dumper($cmdline);

$cmdline =~ s/^(?:\Q$^X\E|perl(?:\.exe|\.bat|\.cmd)?)\s+(?:\Q$0\E\s+)?
+//; # hack!!
print "some_cmd ", $cmdline, "\n";

__END__

X:\Perl>perl cmdline.pl "1 2" "3" 4

$VAR1 = "perl  cmdline.pl \"1 2\" \"3\" 4";
some_cmd "1 2" "3" 4
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Update:

PS: I don't think this question is overly Win specific, when creating a bash script on Linux I'd face the same problem.

On Linux, your Perl script could theoretically have been invoked by execvp, meaning there actually is no command line in the first place. I think you'd have to settle with using String::ShellQuote on @ARGV (note that it only supports bash style quoting).