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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.
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Which one in specific? There are some packages which maintainers did not bother creating xdg desktop specification... you can look into nixpkgs source code to see if they are specified there or not.
I do not know if Debian is able to pick the desktop files though
Adding those lines to .bashrc, helped with the flatpak commands. I can run them without having to type "flatpak run". I did this for nix: export XDG_DATA_DIRS=$HOME/.nix-profile/share:$HOME/.share:"${XDG_DATA_DIRS:-/usr/local/share/:/usr/share/}" However, I still cannot see the entries in rofi. The package is Chromium browser.
On my NixOS, nix sets the environment variables XDG_DATA_DIRS, XDG_CONFIG_DIRS, etc. Maybe these contain what you‘re looking for? Do you have a path ~/.nix-profile/share/applications?
I have this line export XDG_DATA_DIRS=$HOME/.nix-profile/share:$HOME/.share:"${XDG_DATA_DIRS:-/usr/local/share/:/usr/share/}" Do I need to add anything else? I do have the directory you have mentioned.