A non-transitory storage medium stores a supporting program executable by a computer of an information processing apparatus. The supporting program is configured to support a printing program of an operating system and conforms to a printer connected to the information processing apparatus. When executed by the computer, the supporting program causes the information processing apparatus to execute, when image data is inputted from the printing program in response to receiving the print instruction outputted from an application program for causing the printing program of the operating system to perform printing the image by the printer, adding header information, footer information, or both the header information and the footer information to the image data, and causing the printer to perform printing based on the image data to which the header information, the footer information, or both the header information and the footer information is added.