/usr/share/doc/gcal/examples/gcalmagic.add is in gcal-common 3.6.1-2.
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 6 7 8 9 10 11 12 | #
# GNU cal file types
#
# Shell script file
0 string #\ `gcal' Gcal shell script text
13 string #\ `gcal' Gcal shell script text
# Response file
0 string ;\ `gcal' Gcal response file
# Resource file (just a try)
0 string ;\ ct2gcal Gcal resource file
0 string ;\ cal2gcal Gcal resource file
0 string ; Gcal resource file
|