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It seems to be leftover form the support for java but the effect is that you can't create files in the IDE with more than one dot in the name and in fact file names need to comply with the Java rules for file names (even HTML). The default should be the other way round, the rule should be anything that is a valid file name by default goes, and scripting languages that have specific constraint need to be able to plug them on demand precisely for their file types only.