The handling of files may be an important feature of an application. For example, the application may require a spreadsheet file with experimental data as input, a CAD file to be imported, or a report to be generated and exported. The Application Builder provides tools for reading and writing entire files or portions of a file. The way that this is done will vary depending on the system where the application is running. The file system may be different on the computer running COMSOL Multiphysics, where the application is developed, and on the computer where COMSOL Server is installed and the application will run once it is deployed. For more in-depth information on reading and writing various types of data to file, see the Application Programming Guide.