Roger, that should work fine because witandhumor is using apostrophes (single ticks). These are all the same thing on Win32:

$directory = 'c:\my_directory';
$directory = 'c:/my_directory';
$directory = "c:\\my_directory";
$directory = "c:/my_directory";
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Basically, if you're going to need to expand any variables, you need to use quotes (double ticks), but for literals it's easier to use apostrophes.