This is a general question for the symbianOS coders.
Is it possible, if you've got the source code of a program usualy for symbian os < 9.1 to create a .sis file on your own (without changing something on the source code) that worx with 9.1?
WEll.. short answer.. NO. Symbian OS 9.. has new format for the applications, so you can't run old application on new phones even if you would make new sis files out of the old binaries.