.

Author: lihaoyi

scala/scala-impl/resources/META-INF/scala-plugin-common.xml

@@ -153,7 +153,7 @@
 
         <errorHandler implementation="org.jetbrains.plugins.scala.ScalaErrorReportSubmitter"/>
         <autoImportOptionsProvider instance="org.jetbrains.plugins.scala.editor.autoimport.ScalaAutoImportOptionsProvider"/>
-        <fileType name="Scala" language="Scala" extensions="scala"
+        <fileType name="Scala" language="Scala" extensions="scala,mill"
                   implementationClass="org.jetbrains.plugins.scala.ScalaFileType" fieldName="INSTANCE"/>
         <editorHighlighterProvider filetype="Scala"
                                    implementationClass="org.jetbrains.plugins.scala.highlighter.ScalaEditorHighlighterProvider"/>