Our MediaWiki installation is auto-linking the word "files".  So
Here are some files: a, b, c
would result in the word "files" being linked to http://ourhost/mediawiki/files.
Why is that happening and how do I make it stop? I can use the nowiki tag, but perhaps it does not surprise you that the word "files" appears often, and it is aggravating to use that tag all the time.
Here is some info on our MediaWiki installation from Special:Version.  Yes, it's old.
  Installed software
  
  Product   Version
  
  MediaWiki 1.16.5
  
  PHP   5.2.14-pl0-gentoo
  (apache2handler)
  
  MySQL 5.0.84
  
  Installed extensions
  
  Parser hooks GoogleDocs4MW (Version 1.1)  Adds  tag
  for Google Docs' spreadsheets display Jack Phoenix SyntaxHighlight
  (Version 1.0.8.6) Provides syntax highlighting  using GeSHi
  Highlighter   Brion Vibber, Tim Starling, Rob Church and Niklas Laxström
  
  WebServiceSequenceDiagram(Version 1.0)    Render inline sequence diagrams
  using websequencediagrams.com Eddie Olsson Other MWSearch MWSearch
  plugin    Kate Turner and Brion Vibber
  
  Extension functions
  efLucenePrefixSetup
  
  Parser extension tags gallery,
  googlespreadsheet, html, nowiki, pre, sequencediagram,
  source and syntaxhighlight
  
  Parser function hooks
  anchorencode,
  basepagename, basepagenamee, defaultsort, displaytitle, filepath,
  formatdate, formatnum, fullpagename, fullpagenamee, fullurl, fullurle,
  gender, grammar, int, language, lc, lcfirst, localurl, localurle,
  namespace, namespacee, ns, nse, numberingroup, numberofactiveusers,
  numberofadmins, numberofarticles, numberofedits, numberoffiles,
  numberofpages, numberofusers, numberofviews, padleft, padright,
  pagename, pagenamee, pagesincategory, pagesize, plural,
  protectionlevel, special, subjectpagename, subjectpagenamee,
  subjectspace, subjectspacee, subpagename, subpagenamee, tag,
  talkpagename, talkpagenamee, talkspace, talkspacee, uc, ucfirst and
  urlencode