VSCode file extensions (.sql, .yaml, .md)

[dapearce]

I'd like to see file extensions for .sql, .yaml, and .md added to VSCode. It appears they are currently configured as languages, but not file extensions (https://github.com/microsoft/vscode/blob/main/extensions/theme-seti/icons/vs-seti-icon-theme.json).

I am using the Better Jinja package, which introduces jinja-sql, jinja-md, and jinja-yaml languages. As a result of the Icon being associated to languages and not file extensions in VSCode, applying these jinja- languages to a file removes the relevant icon association even though the files still have .sql, .md, and .yaml file extensions.

I was attempting to submit a PR for this but these seem to be listed in mapping.less as file extensions already, so it's not clear how/where the VSCode file is being generated to configure them as languages but not file extensions?