diff --git a/runtime/plugin/vimballPlugin.vim b/runtime/plugin/vimballPlugin.vim
index d7473a0..cd14efa 100644
--- a/runtime/plugin/vimballPlugin.vim
+++ b/runtime/plugin/vimballPlugin.vim
@@ -28,10 +28,16 @@
 com! -nargs=* -complete=dir  RmVimball						call vimball#SaveSettings()|call vimball#RmVimball(<f-args>)|call vimball#RestoreSettings()
 augroup Vimball
  au!
- au BufEnter  *.vba,*.vba.gz,*.vba.bz2,*.vba.zip,*.vba.xz	setlocal bt=nofile fmr=[[[,]]] fdm=marker|if &ff != 'unix'|setlocal ma ff=unix noma|endif|if line('$') > 1|call vimball#ShowMesg(0,"Source this file to extract it! (:so %)")|endif
+ au BufEnter  *.vba,*.vba.gz,*.vba.bz2,*.vba.zip,*.vba.xz
+	   \ if getline(1) =~ '^" Vimball Archiver' |
+	   \  setlocal bt=nofile fmr=[[[,]]] fdm=marker|if &ff != 'unix'|setlocal ma ff=unix noma|endif|if line('$') > 1|call vimball#ShowMesg(0, "Source this file to extract it! (:so %)")|endif |
+	   \ endif
  au SourceCmd *.vba.gz,*.vba.bz2,*.vba.zip,*.vba.xz			let s:origfile=expand("%")|if expand("%")!=expand("<afile>") | exe "1sp" fnameescape(expand("<afile>"))|endif|call vimball#Decompress(expand("<amatch>"))|so %|if s:origfile!=expand("<afile>")|close|endif
  au SourceCmd *.vba											if expand("%")!=expand("<afile>") | exe "1sp" fnameescape(expand("<afile>"))|call vimball#Vimball(1)|close|else|call vimball#Vimball(1)|endif
- au BufEnter  *.vmb,*.vmb.gz,*.vmb.bz2,*.vmb.zip,*.vmb.xz	setlocal bt=nofile fmr=[[[,]]] fdm=marker|if &ff != 'unix'|setlocal ma ff=unix noma|endif|if line('$') > 1|call vimball#ShowMesg(0,"Source this file to extract it! (:so %)")|endif
+ au BufEnter  *.vmb,*.vmb.gz,*.vmb.bz2,*.vmb.zip,*.vmb.xz
+	   \ if getline(1) =~ '^" Vimball Archiver' |
+	   \  setlocal bt=nofile fmr=[[[,]]] fdm=marker|if &ff != 'unix'|setlocal ma ff=unix noma|endif|if line('$') > 1|call vimball#ShowMesg(0,"Source this file to extract it! (:so %)")|endif |
+	   \ endif
  au SourceCmd *.vmb.gz,*.vmb.bz2,*.vmb.zip,*.vmb.xz			let s:origfile=expand("%")|if expand("%")!=expand("<afile>") | exe "1sp" fnameescape(expand("<afile>"))|endif|call vimball#Decompress(expand("<amatch>"))|so %|if s:origfile!=expand("<afile>")|close|endif
  au SourceCmd *.vmb											if expand("%")!=expand("<afile>") | exe "1sp" fnameescape(expand("<afile>"))|call vimball#Vimball(1)|close|else|call vimball#Vimball(1)|endif
 augroup END
@@ -41,3 +47,5 @@
 " vim: fdm=marker
 let &cpo= s:keepcpo
 unlet s:keepcpo
+
+" vim: ts=4: