diff --git a/autoload/vimwiki/base.vim b/autoload/vimwiki/base.vim
index 783ace8..02b7b61 100644
--- a/autoload/vimwiki/base.vim
+++ b/autoload/vimwiki/base.vim
@@ -324,10 +324,10 @@ function! vimwiki#base#resolve_link(link_text, ...) "{{{
     if vimwiki#path#is_link_to_dir(link_text)
       if vimwiki#vars#get_global('dir_link') != ''
         let link_infos.filename .= vimwiki#vars#get_global('dir_link') .
-              \ VimwikiGet('ext', link_infos.index)
+              \ vimwiki#vars#get_wikilocal('ext', link_infos.index)
       endif
     else
-      let link_infos.filename .= VimwikiGet('ext', link_infos.index)
+      let link_infos.filename .= vimwiki#vars#get_wikilocal('ext', link_infos.index)
     endif
 
   elseif link_infos.scheme ==# 'diary'
@@ -337,7 +337,7 @@ function! vimwiki#base#resolve_link(link_text, ...) "{{{
           \ vimwiki#vars#get_wikilocal('path', link_infos.index) .
           \ vimwiki#vars#get_wikilocal('diary_rel_path', link_infos.index) .
           \ link_text .
-          \ VimwikiGet('ext', link_infos.index)
+          \ vimwiki#vars#get_wikilocal('ext', link_infos.index)
   elseif (link_infos.scheme ==# 'file' || link_infos.scheme ==# 'local')
         \ && is_relative
     let link_infos.filename = simplify(root_dir . link_text)
@@ -437,9 +437,9 @@ function! vimwiki#base#get_globlinks_escaped() abort "{{{only get links from the
   let orig_pwd = getcwd()
   lcd! %:h
   " all path are relative to the current file's location 
-  let globlinks = glob('*'.VimwikiGet('ext'),1)."\n"
+  let globlinks = glob('*'.vimwiki#vars#get_wikilocal('ext'), 1)."\n"
   " remove extensions
-  let globlinks = substitute(globlinks, '\'.VimwikiGet('ext').'\ze\n', '', 'g')
+  let globlinks = substitute(globlinks, '\'.vimwiki#vars#get_wikilocal('ext').'\ze\n', '', 'g')
   " restore the original working directory
   exe 'lcd! '.orig_pwd
   " convert to a List
@@ -481,7 +481,7 @@ function! vimwiki#base#goto(...) "{{{
   let anchor = a:0 > 1 ? a:2 : ''
 
   call vimwiki#base#edit_file(':e',
-        \ vimwiki#vars#get_wikilocal('path') . key . VimwikiGet('ext'),
+        \ vimwiki#vars#get_wikilocal('path') . key . vimwiki#vars#get_wikilocal('ext'),
         \ anchor)
 endfunction "}}}
 
@@ -526,7 +526,7 @@ function! vimwiki#base#find_files(wiki_nr, directories_only)
   if a:directories_only
     let ext = '/'
   else
-    let ext = VimwikiGet('ext', wiki_nr)
+    let ext = vimwiki#vars#get_wikilocal('ext', wiki_nr)
   endif
   " if current wiki is temporary -- was added by an arbitrary wiki file then do
   " not search wiki files in subdirectories. Or it would hang the system if
@@ -790,8 +790,8 @@ function! vimwiki#base#check_links() "{{{
 
   " mark every index file as reachable
   for idx in range(len(g:vimwiki_list))
-    let index_file = vimwiki#vars#get_wikilocal('path', idx) . VimwikiGet('index', idx) .
-          \ VimwikiGet('ext', idx)
+    let index_file = vimwiki#vars#get_wikilocal('path', idx) . vimwiki#vars#get_wikilocal('index', idx) .
+          \ vimwiki#vars#get_wikilocal('ext', idx)
     if filereadable(index_file)
       let reachable_wikifiles[index_file] = 1
     endif
@@ -976,7 +976,7 @@ function! s:update_wiki_links_dir(dir, old_fname, new_fname) " {{{
   let old_fname_r = vimwiki#base#apply_template(
         \ g:vimwiki_WikiLinkMatchUrlTemplate, old_fname, '', '')
 
-  let files = split(glob(vimwiki#vars#get_wikilocal('path').a:dir.'*'.VimwikiGet('ext')), '\n')
+  let files = split(glob(vimwiki#vars#get_wikilocal('path').a:dir.'*'.vimwiki#vars#get_wikilocal('ext')), '\n')
   for fname in files
     call s:update_wiki_link(fname, old_fname_r, new_fname)
   endfor
@@ -1030,7 +1030,7 @@ function! s:get_wiki_buffers() "{{{
   while bcount<=bufnr("$")
     if bufexists(bcount)
       let bname = fnamemodify(bufname(bcount), ":p")
-      if bname =~# VimwikiGet('ext')."$"
+      if bname =~# vimwiki#vars#get_wikilocal('ext')."$"
         let bitem = [bname, getbufvar(bname, "vimwiki_prev_link")]
         call add(blist, bitem)
       endif
@@ -1309,8 +1309,8 @@ function! vimwiki#base#goto_index(wnum, ...) "{{{
 
   call Validate_wiki_options(idx)
   call vimwiki#base#edit_file(cmd,
-        \ vimwiki#vars#get_wikilocal('path', idx).VimwikiGet('index', idx).
-        \ VimwikiGet('ext', idx),
+        \ vimwiki#vars#get_wikilocal('path', idx).vimwiki#vars#get_wikilocal('index', idx).
+        \ vimwiki#vars#get_wikilocal('ext', idx),
         \ '')
   call vimwiki#base#setup_buffer_state(idx)
 endfunction "}}}
@@ -1378,7 +1378,7 @@ function! vimwiki#base#rename_link() "{{{
   endif
   
   let new_link = subdir.new_link
-  let new_fname = vimwiki#vars#get_wikilocal('path') . new_link . VimwikiGet('ext')
+  let new_fname = vimwiki#vars#get_wikilocal('path') . new_link . vimwiki#vars#get_wikilocal('ext')
 
   " do not rename if file with such name exists
   let fname = glob(new_fname)
@@ -1886,7 +1886,7 @@ endfunction " }}}
 
 " s:normalize_link_in_diary
 function! s:normalize_link_in_diary(lnk) " {{{
-  let link = a:lnk . VimwikiGet('ext')
+  let link = a:lnk . vimwiki#vars#get_wikilocal('ext')
   let link_wiki = vimwiki#vars#get_wikilocal('path') . '/' . link
   let link_diary = vimwiki#vars#get_wikilocal('path') . '/'
         \ . vimwiki#vars#get_wikilocal('diary_rel_path') . '/' . link
diff --git a/autoload/vimwiki/diary.vim b/autoload/vimwiki/diary.vim
index 744f41c..609dbf3 100644
--- a/autoload/vimwiki/diary.vim
+++ b/autoload/vimwiki/diary.vim
@@ -27,7 +27,7 @@ endfunction "}}}
 
 function! s:diary_index(...) "{{{
   let idx = a:0 == 0 ? g:vimwiki_current_idx : a:1
-  return s:diary_path(idx).vimwiki#vars#get_wikilocal('diary_index', idx).VimwikiGet('ext', idx)
+  return s:diary_path(idx).vimwiki#vars#get_wikilocal('diary_index', idx).vimwiki#vars#get_wikilocal('ext', idx)
 endfunction "}}}
 
 function! vimwiki#diary#diary_date_link(...) "{{{
@@ -84,7 +84,7 @@ endfun "}}}
 
 fun! s:get_diary_links() "{{{
   let rx = '^\d\{4}-\d\d-\d\d'
-  let s_files = glob(vimwiki#vars#get_wikilocal('path').vimwiki#vars#get_wikilocal('diary_rel_path').'*'.VimwikiGet('ext'))
+  let s_files = glob(vimwiki#vars#get_wikilocal('path').vimwiki#vars#get_wikilocal('diary_rel_path').'*'.vimwiki#vars#get_wikilocal('ext'))
   let files = split(s_files, '\n')
   call filter(files, 'fnamemodify(v:val, ":t") =~# "'.escape(rx, '\').'"')
 
@@ -286,7 +286,7 @@ function vimwiki#diary#calendar_sign(day, month, year) "{{{
   let day = s:prefix_zero(a:day)
   let month = s:prefix_zero(a:month)
   let sfile = vimwiki#vars#get_wikilocal('path').vimwiki#vars#get_wikilocal('diary_rel_path').
-        \ a:year.'-'.month.'-'.day.VimwikiGet('ext')
+        \ a:year.'-'.month.'-'.day.vimwiki#vars#get_wikilocal('ext')
   return filereadable(expand(sfile))
 endfunction "}}}
 
diff --git a/autoload/vimwiki/html.vim b/autoload/vimwiki/html.vim
index 5c466ec..109965e 100644
--- a/autoload/vimwiki/html.vim
+++ b/autoload/vimwiki/html.vim
@@ -164,7 +164,7 @@ function! s:delete_html_files(path) "{{{
     " delete if there is no corresponding wiki file
     let subdir = vimwiki#base#subdir(vimwiki#vars#get_wikilocal('path_html'), fname)
     let wikifile = vimwiki#vars#get_wikilocal('path').subdir.
-          \fnamemodify(fname, ":t:r").VimwikiGet('ext')
+          \fnamemodify(fname, ":t:r").vimwiki#vars#get_wikilocal('ext')
     if filereadable(wikifile)
       continue
     endif
@@ -1357,7 +1357,7 @@ function! vimwiki#html#CustomWiki2HTML(path, wikifile, force) "{{{
   echomsg system(vimwiki#vars#get_wikilocal('custom_wiki2html'). ' '.
       \ a:force. ' '.
       \ VimwikiGet('syntax'). ' '.
-      \ strpart(VimwikiGet('ext'), 1). ' '.
+      \ strpart(vimwiki#vars#get_wikilocal('ext'), 1). ' '.
       \ shellescape(a:path). ' '.
       \ shellescape(a:wikifile). ' '.
       \ shellescape(s:default_CSS_full_name(a:path)). ' '.
@@ -1544,7 +1544,7 @@ function! vimwiki#html#WikiAll2HTML(path_html) "{{{
   let current_subdir = VimwikiGet('subdir')
   let current_invsubdir = VimwikiGet('invsubdir')
 
-  let wikifiles = split(glob(vimwiki#vars#get_wikilocal('path').'**/*'.VimwikiGet('ext')), '\n')
+  let wikifiles = split(glob(vimwiki#vars#get_wikilocal('path').'**/*'.vimwiki#vars#get_wikilocal('ext')), '\n')
   for wikifile in wikifiles
     let wikifile = fnamemodify(wikifile, ":p")
 
diff --git a/autoload/vimwiki/markdown_base.vim b/autoload/vimwiki/markdown_base.vim
index ef2eb36..e35e8b0 100644
--- a/autoload/vimwiki/markdown_base.vim
+++ b/autoload/vimwiki/markdown_base.vim
@@ -109,7 +109,7 @@ function! vimwiki#markdown_base#follow_link(split, ...) "{{{ Parse link at curso
       if !VimwikiLinkHandler(lnk)
         if !vimwiki#markdown_base#open_reflink(lnk)
           " remove the extension from the filename if exists
-          let lnk = substitute(lnk, VimwikiGet('ext').'$', '', '')
+          let lnk = substitute(lnk, vimwiki#vars#get_wikilocal('ext').'$', '', '')
           call vimwiki#base#open_link(cmd, lnk)
         endif
       endif
diff --git a/autoload/vimwiki/tags.vim b/autoload/vimwiki/tags.vim
index d0fa45d..311c111 100644
--- a/autoload/vimwiki/tags.vim
+++ b/autoload/vimwiki/tags.vim
@@ -261,7 +261,7 @@ function! s:write_tags_metadata(metadata) "{{{
       let entry_data = substitute(entry_data, "\n", '\\n', 'g')
       call add(tags,
             \   entry.tagname  . "\t"
-            \ . pagename . VimwikiGet('ext') . "\t"
+            \ . pagename . vimwiki#vars#get_wikilocal('ext') . "\t"
             \ . entry.lineno
             \ . ';"'
             \ . "\t" . "vimwiki:" . entry_data
diff --git a/ftplugin/vimwiki.vim b/ftplugin/vimwiki.vim
index ab9118c..970bb69 100644
--- a/ftplugin/vimwiki.vim
+++ b/ftplugin/vimwiki.vim
@@ -27,7 +27,7 @@ if vimwiki#vars#get_global('conceallevel') && exists("+conceallevel")
 endif
 
 " GOTO FILE: gf {{{
-execute 'setlocal suffixesadd='.VimwikiGet('ext')
+execute 'setlocal suffixesadd='.vimwiki#vars#get_wikilocal('ext')
 setlocal isfname-=[,]
 " gf}}}
 
@@ -279,10 +279,10 @@ command! -buffer -nargs=0 VimwikiBacklinks call vimwiki#base#backlinks()
 command! -buffer -nargs=0 VWB call vimwiki#base#backlinks()
 
 exe 'command! -buffer -nargs=* VimwikiSearch lvimgrep <args> '.
-      \ escape(vimwiki#vars#get_wikilocal('path').'**/*'.VimwikiGet('ext'), ' ')
+      \ escape(vimwiki#vars#get_wikilocal('path').'**/*'.vimwiki#vars#get_wikilocal('ext'), ' ')
 
 exe 'command! -buffer -nargs=* VWS lvimgrep <args> '.
-      \ escape(vimwiki#vars#get_wikilocal('path').'**/*'.VimwikiGet('ext'), ' ')
+      \ escape(vimwiki#vars#get_wikilocal('path').'**/*'.vimwiki#vars#get_wikilocal('ext'), ' ')
 
 command! -buffer -nargs=+ -complete=custom,vimwiki#base#complete_links_escaped
       \ VimwikiGoto call vimwiki#base#goto(<f-args>)
diff --git a/plugin/vimwiki.vim b/plugin/vimwiki.vim
index 3e65cbd..26eb8dd 100644
--- a/plugin/vimwiki.vim
+++ b/plugin/vimwiki.vim
@@ -274,12 +274,9 @@ endfunction "}}}
 function! s:vimwiki_get_known_extensions() " {{{
   " Getting all extensions that different wikis could have
   let extensions = {}
-  for wiki in g:vimwiki_list
-    if has_key(wiki, 'ext')
-      let extensions[wiki.ext] = 1
-    else
-      let extensions['.wiki'] = 1
-    endif
+  for idx in range(vimwiki#vars#number_of_wikis())
+    let ext = vimwiki#vars#get_wikilocal('ext', idx)
+    let extensions[ext] = 1
   endfor
   " append extensions from g:vimwiki_ext2syntax
   for ext in keys(vimwiki#vars#get_global('ext2syntax'))
@@ -320,8 +317,6 @@ endif "}}}
 
 " DEFAULT wiki {{{
 let s:vimwiki_defaults = {}
-let s:vimwiki_defaults.index = 'index'
-let s:vimwiki_defaults.ext = '.wiki'
 let s:vimwiki_defaults.syntax = 'default'
 
 " is wiki temporary -- was added to g:vimwiki_list by opening arbitrary wiki