/usr/share/gnumeric/1.10.17/autoformat-templates/Colourful/.category is in gnumeric-common 1.10.17-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | <?xml version="1.0"?>
<gmr:FormatTemplateCategory xmlns:gmr="http://www.gnome.org/gnumeric/format-template-category/v1">
<gmr:Information name="Colourful" description="Colourful"/>
</gmr:FormatTemplateCategory>
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