An application file with read-only protection policy cannot be deleted. However, it is sometimes appropriate to need such a file deleted, as when a read-only script include is unintentionally duplicated.
A read-only protection policy applies special protection to an application file that prevents it from being modified or deleted. Only ServiceNow employees can alter the protection policy of an application file, and then modify or delete it.
Please contact ServiceNow Technical Support for assistance to delete the application file.