This is Nautilus, the file manager for the GNOME desktop.
https://wiki.gnome.org/Apps/Nautilus

Hacking on Nautilus
===================

To build the development version of Nautilus and hack on the code
see the general guide for build the GNOME platform at
https://wiki.gnome.org/Newcomers/BuildGnome

Guidelines and tutorials to contribute to the GNOME platform
are in https://wiki.gnome.org/Newcomers/CodeContributionWorkflow

Mailing List
============

The nautilus mailing list is nautilus-list@gnome.org.  Subscription
information is available at
https://mail.gnome.org/mailman/listinfo/nautilus-list

How to report bugs
==================

Bugs should be reported to the GNOME bug tracking system
(https://bugzilla.gnome.org), in the "nautilus" product.

Please read the following page on how to prepare a useful bug report:
https://bugzilla.gnome.org/bug-HOWTO.html