embedding python in a plugin

Hi,

I'm developing a linux plugin to a CG package that embeds a Python
interpreter. The plugin.so requires a companion plugin.sog file in its
directory to allow module imports; imports fail without the .sog file.

Can somebody please explain what the .sog file does and why it is
needed? I can't find any mention of this in the extending/embedding docs
or the CG package documentation. Or is this a linux thing?

Thanks,
Roger
.