Sure, I hide the absolute path which contains the information of my home directory.
We find only one instance of frogansplayer.desktop in the system:
$ sudo find / -name frogansplayer.desktop -type f 2> /dev/null
[sudo] password for ****:
/home/****/.local/share/applications/frogansplayer.desktop
Since youâre on Ubuntu with Gnome, could you please ensure the xdg-desktop-portal-gnome package is installed, it looks like it probably is and should be by default, but itâs worth double checking.
sudo apt install xdg-desktop-portal-gnome
Hello @James-Carroll
Yes, I have re-installed it several times. Here is the installed packages:
$ dpkg -l | grep 'xdg\|snap'
rc chromium-browser 1:85.0.4183.83-0ubuntu2.22.04.1 amd64 Transitional package - chromium-browser -> chromium snap
ii firefox 1:1snap1-0ubuntu2 amd64 Transitional package - firefox -> firefox snap
ii firefox-locale-en 1:1snap1-0ubuntu2 all Transitional package - firefox-locale-en -> firefox snap
ii gir1.2-snapd-1:amd64 1.60-0ubuntu1 amd64 Typelib file for libsnapd-glib1
ii gnome-software-plugin-snap 41.5-2ubuntu2 amd64 Snap support for GNOME Software
ii libsnapd-glib1:amd64 1.60-0ubuntu1 amd64 GLib snapd library
ii libsnappy1v5:amd64 1.1.8-1build3 amd64 fast compression/decompression library
rc plasma-discover-backend-snap 5.24.7-0ubuntu0.1 amd64 Discover software management suite - Snap backend
ii python3-xdg 0.27-2 all Python 3 library to access freedesktop.org standards
ii snapd 2.61.3+22.04 amd64 Daemon and tooling that enable snap packages
ii xdg-dbus-proxy 0.1.3-1 amd64 filtering D-Bus proxy
ii xdg-desktop-portal 1.14.4-1ubuntu2~22.04.1 amd64 desktop integration portal for Flatpak and Snap
ii xdg-desktop-portal-gnome 42.1-0ubuntu1 amd64 GNOME portal backend for xdg-desktop-portal
ii xdg-desktop-portal-gtk 1.14.0-1build1 amd64 GTK+/GNOME portal backend for xdg-desktop-portal
ii xdg-desktop-portal-kde 5.24.7-0ubuntu0.1 amd64 backend implementation for xdg-desktop-portal using Qt
ii xdg-user-dirs 0.17-2ubuntu4 amd64 tool to manage well known user directories
ii xdg-user-dirs-gtk 0.10-3build2 amd64 tool to manage well known user directories (Gtk extension)
ii xdg-utils 1.1.3-4.1ubuntu3~22.04.1 all desktop integration utilities from freedesktop.org
My concern looking at that list is that thereâs both -kde and -gnome alongside each other. The 1.14 versions of the portals will pick one or the other and canât mix and match (from what I believe, since Iâve read this is improved in 1.18). Technically they can work in the wrong environment, but itâd potentially open up issues like this.
Can you confirm the distribution version youâre running this on? The opening post says 23.10 but the package lists suggests 22.04, 23.10 should already be on 1.18.
My suggestion here would be to try to purge the xdg-desktop-portal packages and then reinstall them fresh focusing on just the xdg-desktop-portal-gnome package itself, so that the config isnât split between KDE-isms and Gnome-ismâs.
Hello @baldeuniversel
Indeed, it is strange. the MIME type has neither registered applications nor recommended applications. Maybe that is the problem.
$ gio mime x-scheme-handler/leaptofrogans
Default application for âx-scheme-handler/leaptofrogansâ: frogansplayer.desktop
No registered applications
No recommended applications
I have just checked the output of this command on Kubuntu where the Firefox snap version can open the external application. Itâs the same output for the above command.
Well @wylink .
You can follow the @James-Carroll scenario. Otherwise, we can attempt to install/config our own mime .
And if you do this :
gio mime application/leaptofrogans
Hello @James-Carroll Ok, I have purged the xdg-desktop-portal and re-install it. But the problem remains.
$ dpkg -l | grep 'xdg\|snap'
rc chromium-browser 1:85.0.4183.83-0ubuntu2.22.04.1 amd64 Transitional package - chromium-browser -> chromium snap
ii firefox 1:1snap1-0ubuntu2 amd64 Transitional package - firefox -> firefox snap
ii firefox-locale-en 1:1snap1-0ubuntu2 all Transitional package - firefox-locale-en -> firefox snap
ii gir1.2-snapd-1:amd64 1.60-0ubuntu1 amd64 Typelib file for libsnapd-glib1
ii gnome-software-plugin-snap 41.5-2ubuntu2 amd64 Snap support for GNOME Software
ii libsnapd-glib1:amd64 1.60-0ubuntu1 amd64 GLib snapd library
ii libsnappy1v5:amd64 1.1.8-1build3 amd64 fast compression/decompression library
rc plasma-discover-backend-snap 5.24.7-0ubuntu0.1 amd64 Discover software management suite - Snap backend
ii python3-xdg 0.27-2 all Python 3 library to access freedesktop.org standards
ii snapd 2.61.3+22.04 amd64 Daemon and tooling that enable snap packages
ii xdg-dbus-proxy 0.1.3-1 amd64 filtering D-Bus proxy
ii xdg-desktop-portal 1.14.4-1ubuntu2~22.04.1 amd64 desktop integration portal for Flatpak and Snap
ii xdg-desktop-portal-gnome 42.1-0ubuntu1 amd64 GNOME portal backend for xdg-desktop-portal
ii xdg-desktop-portal-gtk 1.14.0-1build1 amd64 GTK+/GNOME portal backend for xdg-desktop-portal
ii xdg-user-dirs 0.17-2ubuntu4 amd64 tool to manage well known user directories
ii xdg-user-dirs-gtk 0.10-3build2 amd64 tool to manage well known user directories (Gtk extension)
ii xdg-utils 1.1.3-4.1ubuntu3~22.04.1 all desktop integration utilities from freedesktop.org
Hello @baldeuniversel
$ gio mime application/leaptofrogans
No default applications for âapplication/leaptofrogansâ
I donât think it is about application MIME type.
Hello,
If I manually add a line under the [Added Associations] in .config/mimeapps.list as below, the Firefox can open correctly the associated external application if we click on the corresponding URL Scheme link.
[Added Associations]
x-scheme-handler/leaptofrogans=frogansplayer.desktop
And the following command gives also the good registered and recommanded applications:
$ gio mime x-scheme-handler/leaptofrogans
Default application for âx-scheme-handler/leaptofrogansâ: frogansplayer.desktop
Registered applications:
frogansplayer.desktop
Recommended applications:
frogansplayer.desktop
@wylink ! Personally, I would be tempted to create a file of type leaptofrogans.xml like this :
<?xml version="1.0"?>
<mime-info xmlns='http://www.freedesktop.org/standards/shared-mime-info'>
<mime-type type="application/leaptofrogans">
<comment>Frogans ...</comment>
<glob pattern="*.frog"/>
</mime-type>
</mime-info>
Then :
xdg-mime install --mode system leaptofrogans.xml
or
xdg-mime install --mode user leaptofrogans.xml
Then :
xdg-mime default firefox.desktop application/leaptofrogans
@wylink ! With the output you pasted here, you can already do this to conclude 
.
xdg-mime default firefox.desktop x-scheme-handler/leaptofrogans
Thank you for your proposal @baldeuniversel. The last command is trying to associate leaptofrogans with firefox. That is not exactly what I am trying to do. I need to associate the URI scheme leaptofrogans with its corresponding application (named frogans player), and which can be opened whenever we click on URI scheme link on a web page with any web browser.
xdg-mime default firefox.desktop application/leaptofrogans
Hello @baldeuniversel
Do you mean?
xdg-mime default frogansplayer.desktop x-scheme-handler/leaptofrogans
The above command, however, add only a line under [Default Applications] section in mimeapps.list. I should also add manually the line under [Added Associations] section in my case.
[Added Associations]
x-scheme-handler/leaptofrogans=frogansplayer.desktop
[Default Applications]
x-scheme-handler/leaptofrogans=frogansplayer.desktop
Oops, I think we werenât aligned on the same plan. I summarize everything, you want to set up a config which will allow you, based on a pattern, to open from anywhere (the content with) a program called Frogans player which is installed on your system, thatâs it @wylink ?
Might be a silly one but Iâd looked at the screenshot above and the webpage theyâre hosted on, can you try the url with explicitly leaptofrograns:// I.E making sure to include the //.