Wrong filename used when opening image in external editor

Question

When I select an image and choose Open in External Editor, the filename that is used for the opened image is the original filename given from the camera (DSC1234) and not the filename that I choose when importing (DATECUSTOMSEQ).
Why is this? Is this is a bug?

Answer 1

I don't want to export the file to Photoshop, because
I want to keep the modified version in the project in
Aperture, may be for a book later.
Aperture says "open version in external editor", but
it opens the version with the master file name.
That's wrong!
But if it goes back into Aperture under the proper version, does it matter? It seems to me it only matters if you plan to save out the file directly from Photoshop, or if you have many photoshop windows open and want to reply on the version name to keep them stright (whcih I could see).
The reason Aperture uses the master name is because when you open a file for external editing you are actually creating a new master itself, and it's trying to make sure it is tied back to the real original master. All changes based on that externally edited version will treat the PSD or TIFF you edit externally as the new master (versions created against the old master) will still be based on the original master, not the new one...
That is why I advocate trips to external editors as the last step in an Aperture workfow. Otherwise you can end up making a lot of new versions in a hurry.