To Delete a Custom File From a Project
To delete a custom file from a customization project, perform the following actions:
 - Open the customization project in the Customization Project Editor. (See To Open a Project for details.)
 - Click Files in the navigation pane to open the Custom Files page.
 - In the page table, click the item to be deleted.
 - On the page toolbar, click Delete Row (X).
 - On the page toolbar, click Save to save the changes to the customization project.
 
Warning: If you either publish the
        customization project after the File item is deleted or unpublish all customizations
        of the website, the platform deletes the original file in the file system.
