SQL Developer, SQL*Plus woes

I am trying to get used to SQL Developer as a replacement for SQL*Plus, as Oracle saw fit to kill that simple little front end. It loaded fast and you ran your SQL or script. Done is seconds flat.

With SQL*Plus, I can execute a local script with an '_at_' sign;
'_at_run_this_script.sql'. And that script could call another script with
'_at_some_name.sql'. I did not need to put the fully qualified directory
path; it looked for the called script from the same directory where it finds '_at_run_this_script.sql'.

When I try this in SQL Developer, it complains that it can't find the called script.

Error report:
Unable to open file: "C:\Documents and
Settings\SomeUser\lnp_shortcut_report.sql"

How does one do this with SQL Developer?

thanks!
Michael

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