/usr/share/xsessions/IceWM-Experimental.desktop is in icewm-experimental 1.3.7-1ubuntu1.
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 | [Desktop Entry]
Encoding=UTF-8
# The names/descriptions should really be better
Name=IceWM-Experimental
Comment=This is the window manager IceWM with experimental features
Comment[de]=Dies ist der Fenstermanager IceWM mit experimentellen Features
Exec=/usr/bin/icewm-session-experimental
Icon=icewm.xpm
Type=Application
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