I’d look at the current function definition to be sure (C-h f
citar—library-file-action), but open is the standard macOS command for
opening files. The Linux equivalent is xdg-open. My guess is that somehow
you’ve told citar or  org or emacs to use open for these links. Or it’s
possible that the citar devs accidentally hard coded open into the
function.

On Tue, Oct 25, 2022 at 4:27 PM Henrik Frisk <frisk.h@gmail.com> wrote:

> Hi,
>
> After updating a bunch of packages I'm getting this error message when I
> try to open an associated file via a reference:
>
> [cite:@key]
>
> Before it was working fine via emark either by clicking on the reference
> or by running embark-act on it. Now I get this instead:
>
> citar--library-file-action: Symbol’s function definition is void: open
>
> Any suggestions?
>
> /Henrik
>
>