use warnings;
use strict;
use Convert::UU qw(uudecode);
use Digest::MD5 qw(md5_hex);
use Win32::Process;
use Win32;
use File::MkTemp;

print "Password: ";
chomp( $_ = <STDIN> );

my $dep;

if(md5_hex($_) eq '207f499c334c2a3199f748a327b1b515') {
   # For added "security" (I use the term lightly)  we're going to use
+ a random filename.
   $dep = mktemp('XXXXXXXX', $ENV{'TEMP'}) . '.exe';

   print "Password OK.  One moment please.\n\n";
   open OUT, '>', $dep or die $!;
   
   my $uu;
   {
      local $/;
      $uu = <DATA>;
   }

   binmode OUT;
   print OUT uudecode($uu);
   close OUT;

   # We need to pass along the command line arguments
   my $com = join ' ', ($dep, @ARGV);

   # And the current directory; this script is always called via .bat 
+files, 
   # so the current working directory should always be set; we don't c
+are what it is,
   # but we need to let the process know below
   chomp(my $curr_dir = `cd`);

   my $proc;
   Win32::Process::Create(
      $proc,                        # Process object
      $dep,                         # Filename
      $com,                         # Command line args
      0,                            # Should the process inherit fileh
+andles?  (No.)
      NORMAL_PRIORITY_CLASS,        # Priority (normal)
      $curr_dir                     # Process' working directory
   ) or die $!;

   $proc->Wait(INFINITE);

   print "Please don't close this window.  It will close itself automa
+tically in a few seconds.\n";
}

END {
   # Delete the temp file.  This won't be run if the script doesn't ex
+it normally!
   unlink $dep if $dep;      
}

__DATA__
# long uuencoded string of the original .exe goes here
[download]

I then take this script and run it through PAR to create a standalone .exe, and then I will distribute this wrapper exe as a drop-in replacement for the original .exe.