Wow, thanks for the examples. It would seem "simple usage" is not what people would assume it is. I will go file a bug report against PathTools, but it may be instructive to see how easy it is to fall into this trap. Here is the line of code in File::Spec::Win32.pm that caused me all the grief:

  $tmpdir = $_[0]->_tmpdir( @ENV{qw(TMPDIR TEMP TMP)},
                            'SYS:/temp',
                            'C:\system\temp',
                            'C:/temp',
                            '/tmp',
                            '/'  );
[download]

Sure looks innocent, huh? Of course the 'fix' will be to change the references to 'simple' ones,

  $tmpdir = $_[0]->_tmpdir( $ENV{TMPDIR},
                            $ENV{TEMP},
                            $ENV{TMP},
[download]

And in answer to Skeeve, yes, I am a "bug-magnet"

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