/usr/share/mime-info/openjdk-6-archive.keys is in openjdk-6-jre 6b24-1.11.1-4ubuntu2.
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 | application/java-archive
description=Java Archive
icon_filename=openjdk-6
default_action_type=application
default_application_id=java-archive
short_list_application_user_additions=java-archive
application/x-java-archive
description=Java Archive
icon_filename=openjdk-6
default_action_type=application
default_application_id=java-archive
short_list_application_user_additions=java-archive
application/x-jar
description=Java Archive
icon_filename=openjdk-6
default_action_type=application
default_application_id=java-archive
short_list_application_user_additions=java-archive
|