new file mode 100644
--- /dev/null
+++ b/runtime/ftplugin/plaintex.vim
@@ -0,0 +1,48 @@
+" plain TeX filetype plugin
+" Language:     plain TeX (ft=plaintex)
+" Maintainer:   Benji Fisher, Ph.D. <benji@member.AMS.org>
+" Version:	1.0
+" Last Change:	Wed 22 Mar 2006 09:36:32 AM EST
+
+" Only do this when not done yet for this buffer.
+if exists("b:did_ftplugin")
+  finish
+endif
+
+" Don't load another plugin for this buffer.
+let b:did_ftplugin = 1
+
+" Avoid problems if running in 'compatible' mode.
+let s:save_cpo = &cpo
+set cpo&vim
+
+" Set 'comments' to format dashed lists in comments
+setlocal com=sO:%\ -,mO:%\ \ ,eO:%%,:%
+
+" Set 'commentstring' to recognize the % comment character:
+" (Thanks to Ajit Thakkar.)
+setlocal cms=%%s
+
+" Allow "[d" to be used to find a macro definition:
+let &l:define='\\\([egx]\|char\|mathchar\|count\|dimen\|muskip\|skip\|toks\)\='
+	\ .	'def\|\\font\|\\\(future\)\=let'
+	\ . '\|\\new\(count\|dimen\|skip\|muskip\|box\|toks\|read\|write'
+	\ .	'\|fam\|insert\)'
+
+" Tell Vim to recognize \input bar :
+let &l:include = '\\input'
+setlocal suffixesadd=.tex
+
+" The following lines enable the macros/matchit.vim plugin for
+" extended matching with the % key.
+" There is no default meaning for \(...\) etc., but many users define one.
+if exists("loaded_matchit")
+  let b:match_ignorecase = 0
+    \ | let b:match_skip = 'r:\\\@<!\%(\\\\\)*%'
+    \ | let b:match_words = '(:),\[:],{:},\\(:\\),\\\[:\\],' .
+    \ '\\begin\s*\({\a\+\*\=}\):\\end\s*\1'
+endif " exists("loaded_matchit")
+
+let &cpo = s:save_cpo
+
+" vim:sts=2:sw=2: