I'd already tried that but came to the conclusion you couldn't do it for files without an extension

It turns out it was an issue with PathFinder Desktop (which I forgot replaces many aspects of Finder).
Doing it via native oSX Finder works fine as you say, thankyou

On Fri, 6 Sep 2019 at 08:22, <gerti-textmate@bitart.com> wrote:
Finder, right/control-click file, “Open With…”, “Other…”, find app, be sure to have “Always open with” checked.

> On Sep 5, 2019, at 16:28, Carpii UK <carpii.uk@gmail.com> wrote:
>
> If you create an empty file with no file extension (on your desktop for example), then right click it, OSX/Finder offers various app choices to use to 'Open With..'
>
> A lot of other text and code editors appear in this list (Atom, Visual Code, Sublime Text), but TextMate does not
>
> It would be very useful if TM would register itself with OSX in the same way.
> I guess there's some way to do this manually, but if so, I haven't found it yet
>
>
>
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