How does vscode add emmet support for a file type?

when using artTemplate , the .art file does not support emmet . How to set up vscode?

Arttemplate emmet visual-studio-code
Mar.03,2021

resolved 

"files.associations": {
    "*.art":"html"
 }

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b31da1-2b314.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b31da1-2b314.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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