Ancient Macedonian language recognized as Greek dialect

Ancient Macedonian language has been recognised as a Greek dialect.

Specifically, the ISO XMK has the following specification:

Language Name: Ancient Macedonian
Alternate Name(s): Macedonian
Once Spoken in: Greece F.Y.R.O.M
Language Code: xmk (Former code: XMK )
Status: Extinct
Family: Indo-European
Subgroup: Macedonian
Subgrouping Code: Indoeuropean Greek Branch

Brief Description: The ancient language of the Macedonian kingdom in N. Greece and modern Macedonia during the later 1st millennium BC. Survived until the early 1st millennium AD. NOT to be confused with the modern Macedonian language, which is a close relative of the Slavic Bulgarian.