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The File tab is intended for use in Standard App or Widget only as these applications process data using PHP. As a developer, you should include PHP code or provide a link to the PHP code in this tab for SiteGUI to review.
Once the code is reviewed and found to meet SiteGUI standards, it will be integrated into the platform and used to process app data. If you choose to update the code, it must be reviewed again before it can be used with your app.
It is important to note that the File tab is simply a placeholder for your code, and your code will never be executed there. The reviewed code will be moved to an appropriate folder for use with your app.