NetBeans IDE: is there a way to make files read-only or block content?

In the Netbeans IDE, is there a way to make a file read-only or to prevent editing the contents of the file, although the file is part of the project as source code, a test package, or a data file?

PLEASE NOTE: I know that a version control system should be used for any kind of project, and I distinguish any file with a copy of version control before making changes to the repository; I'm just wondering if there is a way to “lock” a file in this editor / IDE.