Saving file as different file type

This may be an issue with the nature of the Finder’s save/duplicate process but I have an issue when I open an OPML file the only way I can save it as an Omnioutliner file is by duplicate the file and then saving the duplicate as only then does the more detailed save dialogue appear. Any change of a ‘Save As’?

This is the OS behavior. Save As has been added back, I think with 10.9, as option-shift-command-s though.

Very helpful thanks. I guess I’m used to Adobe save dialogues more than Apples.