Sample:

...HTML Code...
<?php
  echo "<pre>";
  show_source("test.phtml");
  echo "</pre>\n";
?>
...HTML Code...

This file created with Notepad, will display the following on execution:

...HTML Code...
echo<pre>;show_source(index.phtml);echo</pre>\n;
...HTML Code...

Shouldn't it be:
...HTML Code...
<?php
  echo "<pre>";
  show_source("index.phtml");
  echo "</pre>\n";
?>
...HTML Code...

This occured on precompiled Win32-binary.
Please contact me if you need further information.