When you open an existing ePublisher Express project, ePublisher Express determines if the Stationery used by the project has been modified by examining the checksum of the Stationery file. A checksum is a value that depends on the contents of a file. ePublisher uses the checksum to determine if a Stationery the file has changed. If the checksum of the Stationery file is different than the checksum of the project file, ePublisher Express prompts you to synchronize your project with the Stationery file associated with your project. Any changes to the following settings within the Stationery file will affect the checksum: