On Mediawiki upload module checks mime types.

OPJ extension is blocked  - actually not listed

To upload opj, edit $mediawiki/includes/mime.types

Near the end search 

chemical/x-mdl-rgfile rg

Then add opj at the end of the line like

chemical/x-mdl-rgfile rg opj

In this way you can upload opj files.

Posted by - k3mi5t

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