/usr/share/vim/vim73/ftplugin/xs.vim is in vim-runtime 2:7.3.429-2ubuntu2.
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 filetype plugin file
" Language: XS (Perl extension interface language)
" Maintainer: Andy Lester <andy@petdance.com>
" URL: http://github.com/petdance/vim-perl
" Last Change: 2009-08-14
" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
finish
endif
" Just use the C plugin for now.
runtime! ftplugin/c.vim ftplugin/c_*.vim ftplugin/c/*.vim
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