Opening a PDF in Photoshop directly from Xcode

Hello all,

I'm using vector PDFs in my xcasset file, created by and editable in Photoshop.

When I want to edit one of these files, I can't use "Open with External Editor" as this just shows the PDF in the Preview application. My current process is to "Show in Finder", right-click, Open With > Photoshop, but this seems needlessly messy!

I obviously don't want all PDFs to default to opening in Photoshop, but is there any way of just setting Xcode's external editor binding for PDFs?

Many thanks,
David