[plt-scheme] .rkt not found

Hi,

Using Racket 4.2.5.16 , I added a library path so that I can use my own
files without having to specify the full path (which was crashing in the
previous release).
So one of my programs looks like this:

#lang scheme

(require ATHENS/board2)

where the file is named board2.ss.
This was working perfectly fine in good old PLT Scheme, but it seems that
the current version is looking for a .rkt file instead, and will not
execute:

open-input-file: cannot open input file:
"C:\Users\orseau\Documents\Projets\Scheme\ATHENS\board2.rkt"

It seems that the old .ss naming does not even work:
(require "../ATHENS/board2.ss")
fails to execute, and also asks for a .rkt file.

You are probably already aware of that, but what can I do to make things
work properly? (preferably not specifying the full path, and not having to
rename all my files)

Thanks,
Laurent
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