Save method FileReference is avalable only from
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Flash Player 8
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Flash Player 9
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Flash Player 10
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Flash Player 11
The FileReference.save() method was introduced in Flash Player 10 as part of the file reference API enhancements. It allows applications to save files to the user's local filesystem. Earlier versions (8 and 9) did not have this capability for security reasons.
The FileReference.save() method, which lets an ActionScript/Flex application prompt the user to save data directly to disk (as opposed to only upload/browse via load()), was introduced in Flash Player 10. Earlier versions (8 and 9) only supported FileReference.browse() and upload()/download() for file selection and transfer, not a direct save-to-disk capability. Flash Player 11 came later and simply continued supporting the feature introduced in 10, so it isn't the version where it first became available — Flash Player 10 is the correct answer.