logilab-mtconverter #8955 file format: bad guess ? [deprecated]

https://www.logilab.net/extranet/ticket/20092?selected=20094&vid=ticketscreenshots

exhibits a curious behaviour::

Error: May not be a PDF file (continuing anyway)
Error: PDF file is damaged - attempting to reconstruct xref table...
Error: Couldn't find trailer dictionary
Error: Couldn't read xref table

... since actually it's an odt (and properly named).

priorityimportant
typebug
done in<not specified>
load left0.000
closed by<not specified>