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What you're asking is a solution to the following problem: you want to use group access functions for something outside the XOOPS script. Unless the script you use is ported to the XOOPS platform as a module, and the group access functions are added to that, protecting the page using the group access functions is virtually impossible. At least, not without some advanced programming, which isn't easily implemented (which, judging by your posts, is something you are asking).
There are other ways to protect access to a file/folder (like using .htaccess and .htpassword), but they are outside the XOOPS group access controls, so even members will have to log in using that again.
Herko