/usr/lib/mime/packages/dia-gnome is in dia-gnome 0.97.2-15ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | application/x-dia-diagram; dia '%s'; description="DIA diagram"; test=test -n "$DISPLAY"; nametemplate=%s.dia
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