/etc/X11/Xsession.d/65snappy is in snapd 2.0.2.
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 | # This file is sourced by Xsession(5), not executed.
# Add additionnal the additonal snappy desktop path
XDG_DATA_DIRS=$XDG_DATA_DIRS:/var/lib/snapd/desktop
export XDG_DATA_DIRS
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