@pixelwolf If you just want files with the .ino extension to be recognized as C++, just append *.ino to the list in filetype_extensions.conf (that you can edit easily using Tools → Configuration Files → filetype_extension.conf).

If you want to create a custom filetype, you then need to name your filetype file with the .conf extension, like filetypes.INO.conf (and still need to modify filetype_extensions.conf to get INO files recognized form their extension).

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