You're not creating a new browser window from the CGI script. You're creating a new window based on the user pressing a button in the current browser window. What you need to do is place that button inside a form that has the second script as its action and target set to '_new' (or an unused window name). Something like this in the page generated by Maintain.cgi:

<form action="filetran.cgi" target="_new">
 <input type="submit" value="Start Filetran">
</form>
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