/usr/share/ubuntu-defaults-builder/template/unity/launchers.txt is in ubuntu-defaults-builder 0.49.
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 | # List of .desktop file names (without extension) with additional default launchers
#
# Format: arbitrarily many lines, one .desktop name (without extension) per line
# An optional second word on the line specifies the package name which
# provides this desktop file; this will be added to the defaults package's
# dependencies, just like if it were added to "depends.txt".
#
# Example:
# gnome-sudoku
# simple-scan
# sol aisleriot
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