On 2003-10-29 10:51:16 -0800, (null) said:
XCode Preferences->File Types
There you can specify which editor you would like to open various file types. You can specify different editors for different file types. Emacs is on the list of external editors that pops up. SubEthaEdit (TEFKAH) is the other. There is limited support for BBEdit, vi and others.