[plt-scheme] custom language and #lang in PLT 4

Hi all -

how do I use a custom language that lives in the current directory (i.e.
".") in PLT 4 via #lang?

I tried '#lang "file.scm"' and '#lang file' and they do not work.  The
manual says only alphanumeric, +, -, _, and / works in this position.  Does
that mean we cannot have languages live in the current directory?

Thanks,
yc
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