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GNOME Recognized as Public Interest Infrastructure
(foundation.gnome.org)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Yeah, i mean outside of that. General Gtk and Qt applications.
Outside of that the toolkit's file picker is used, as the system doesn't seem to provide one (via the portal), so the only reasonable fallback is to show the file picker that you know is there, which is the one of the application's toolkit.