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# Modifying Project Configuration Files

Project configuration files have open read/write permissions and anyone can modify them. In some cases, you may want to restrict access to them using the chmod command.

Here are some basic guidelines for modifying project configuration files:

- Do not modify the template project configuration files. These are used by the software to generate new project configuration files and should not be altered. Create a copy of the desired project .cfg file, and modify that in a text editor as needed.
- Create a backup of the project configuration file before making any changes to it.
- Modified project configuration files must end with _custom.cfg.
- You cannot use multiple project configuration files with a single project. A project configuration file must have the same name as its corresponding project and it must be located in the project's cfg directory.