How can I change the directory in the command window so I can use relative paths when executing scripts?

I tried

HOST cd /projects/cv/sql

Then when I executed
@utils/version.sql

I got "Error reading file"

Usually from a terminal windows I cd over to the folder, start sqlplus and then execute my scripts using relative paths.

This is not possible in the Command Window. The HOST CD command only affects the temporary process created for the HOST command, and not PL/SQL Developer or the Command Window.

I have added this to the list of enhancement requests.

Thanks, I did not know that.