Please help me understand Edit-In options

@Rob_Cullen 

I reproduced what you had: added Photoshop.exe as an Additional External Editor.

As you had Ps as an external editor at some stage and seemed to have removed it, the Application must have been still set to Photoshop.exe. I Removed my Photoshop.exe Preset and observe the same as you did: Preset: Custom; Application: Photoshop.exe.

Clicking the Clear button removes the Application. Now I have the same as you have.

Select another Preset (I only have one, Topaz Photo AI) and it becomes the Application. My Edit In... is now

Topaz Photo AI appears twice in the menu. If I put Photoshop back as an additional editor as save it as a new preset, then I get:

Not good, because two applications are now set to the short cut Ctrl+Alt+X.

Since LrC doesn't know if an additional editor can handle a lightroom edits, even if set to Photoshop, a copy is made with edits applied in the format specified. The very top Edit in Adobe Photoshop doesn't need to do this, so a copy isn't made until saved in Ps.

Edit: If the Photoshop.exe is removed from the Additional External Editor list and something else is added, keeping the Topaz Photo AI, then the duplicated keyboard shortcuts disappear.

@Rob_Cullen 

Please provide a screen shot of your Preferences dialog showing the External Editing tab with the Preset dropdown list open under the Additional External Editor section.