xlCompiler project is a plain text file, which stores information about files you want to compile. We are using XML format to store the information, so you can edit or create project files in the external editors.
Project contains the following items:
Every file has Compilation Options. These options define how to compile source spreadsheet file. When you add new file to the project should should fill it's options. Otherwise file can't be compiled. Several files may have same protection options. For example, you add same End-User License Agreement and password to all your files. In this case you should use File Group. All files in group share protection options.