/usr/share/vim/vim80/ftplugof.vim is in vim-runtime 2:8.0.0197-4+deb9u1.
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 | " Vim support file to switch off loading plugins for file types
"
" Maintainer: Bram Moolenaar <Bram@vim.org>
" Last Change: 2011 Oct 20
if exists("did_load_ftplugin")
unlet did_load_ftplugin
endif
" Remove all autocommands in the filetypeplugin group, if any exist.
if exists("#filetypeplugin")
silent! au! filetypeplugin *
endif
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