/usr/lib/x86_64-linux-gnu/vala-panel/applets/icontasks.plugin is in vala-panel-plugins-wnck 0.3.65-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Module=icontasks
Name=Icon Task List
Description=Icon Task List
Authors=Ikey Doherty
Copyright=Copyright © 2015 Ikey Doherty
Website=https://solus-project.com
Icon=tab-new-symbolic
X-ValaPanel-Configurable=true
X-ValaPanel-Expandable=true
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