This file is indexed.

/usr/share/ircd-ratbox/help/opers/invite is in ircd-ratbox 3.0.7.dfsg-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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INVITE <nickname> <channel>

INVITE sends a notice to the user that you have 
asked him/her to come to the specified channel.
If the channel is +i, this will allow the user
to bypass this mode.