/usr/share/app-install/desktop/spacefm-gtk3:spacefm-folder-handler.desktop is in app-install-data 15.10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | [Desktop Entry]
X-AppInstall-Package=spacefm-gtk3
X-AppInstall-Popcon=5
X-AppInstall-Section=universe
Name=SpaceFM Open Folder
Comment=Open folder
TryExec=spacefm
Exec=spacefm %U
NoDisplay=true
Terminal=false
Icon=spacefm
StartupNotify=true
Type=Application
MimeType=inode/directory;
X-Ubuntu-Gettext-Domain=app-install-data
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