'Open User Data' function fails

[klerai]

• I have read the README.md document
• I am using the latest version of Warehouse
• I am using the Flatpak package of Warehouse
• I have not found any other opened issues on the same topic

Describe the issue in detail

'Open user data' for any application end up in QMPlay2 instead of the default file manager.

If applicable, provide steps to reproduce the issue

Run flatpak run io.github.flattool.Warehouse in a terminal and if applicable, show any output

(process:2): Gtk-WARNING **: 18:53:52.090: Locale not supported by C library.
Using the fallback 'C' locale.

(warehouse:2): Gtk-WARNING **: 18:53:52.470: No IM module matching GTK_IM_MODULE=cedilla found

I checked 'xdg-mime query default inode/directory'
org.kde.dolphin.desktop

I am unable to locate where the configuration for QMPlay2 is coming from.