You cannot use SAS Folders (metadata) to stored SAS programs for use in EG. You can use only the file system, local or remote server.
As far as EGAuto.sas, that doesn't exist anymore. The easier method for injecting your own startup code is:
Tools->Options->SAS Programs->Submit SAS code when connecting to server.
The statements that you specify there will run just once, when you connect to the SAS session.
Another cool way (new in EG 4.3) is to create a process flow named "Autoexec". Any programs/tasks that you include in that flow will be run *immediately* when you open the project. That's a project-specific autoexec.
Chris