I really never knew that. How dumb. Both my assumption in not checking what I knew could never be so and the logic that makes me wrong. You'll have to decide for yourself which is dumber:)

It will be a while before I stop thinking about the logic that allows a rename function to become a "delete target and then copy over" command.

You could consider this.

#! perl -slw
use strict;
use Win32::API::Prototype;

ApiLink( 
    'kernel32',
    'UINT GetTempFileName(
      LPCTSTR lpPathName,
      LPCTSTR lpPrefixString,
      UINT uUnique,
      LPTSTR lpTempFileName
    )'
) or die $^E;

my $tempFileName = ' ' x 254;
my $path = '.';
my $prefix = 'temp0000';

GetTempFileName( $path, $prefix, 0, $tempFileName ) or die $^E;

print $tempFileName;
[download]

After the above code has been run, the an empty file with the name returned will have been created. You can then open and use it as you need to.