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The default extension for YAML files is .yml which isn't according to the official YAML FAQ: http://www.yaml.org/faq.html Now Symfony is going to use .yaml as the default and preferred extension as of Symfony 4: http://fabien.potencier.org/symfony4-directory-structure.html - see under "Configuration under etc/" In general it would be good to be able to change the default extension for any file type since that the Netbeans default may not always be the correct choice for some projects.