For those that would like to open rmd files in Obsidian, it is possible to tweak the txt-as-md plugin (GitHub - deathau/txt-as-md-obsidian: Edit txt files in Obsidian.md as if they were markdown) so that it also reads rmd in addition to txt files. In order to do that you need to add ‘rmd’ or whatever the format name is to the array of extensions which should be treated like md files in the main.js file of this plugin.
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