This Bugzilla instance is a read-only archive of historic NetBeans bug reports. To report a bug in NetBeans please follow the project's instructions for reporting issues.
Now you can associate only files with extension after last dot. So for example index.scala.html file used in views in "play framework" can not be associated with scala editor , because netbeans is considering this file only as .html file. You can only link all .html files with this editor now.