Marcin,

I'd like to keep the information you provided as reference.  If I can get over 
this small hurdle with the least customization, I'll take it for now simply 
because I've been banging at this for a while (with your much appreciated help).
--------------------------------------------------
Ben,

It turns out that the following works:

   syntax on
   au Syntax tex setl isk+=_

I didn't even need the autocmd lines:

autocmd BufNewFile,BufRead,BufWinEnter *.tex setl isk+=_ | setg isk+=_

autocmd BufNewFile,BufRead,BufWinEnter *.bib setg isk+=_ | setl isk+=_

The problem is essentially solved that this point.  What follows describes what 
I did in response to your advice on checking whether 
$HOME/vimfiles/after/syntax/tex.vim runs -- it does not.  The word "after" 
doesn't even show up in the :scriptnames listing below.  I think I will save 
that for another day.  But if you have any suggestions (without going out of 
your way to dig), I'd be happy to follow up to the extent that I can.

Thanks !!
--------------------------------------------------
"~" is my short hand for $HOME, which I set in my personal _vimrc via:

      let $HOME=$USERPROFILE."/Documents"
      set rtp^=$HOME/vimfiles

I copied the vimfiles directory tree to .vim just as a desparate act, it didn't 
make any rational sense.

In the code above, $USERPROFILE is C:\Users\MyUserAccount, which makes $HOME 
become C:\Users\MyUserAccount\Documents.  I had to explicitly set up $HOME 
above because the default points at a network drive, which I don't have access 
to unless I'm connected on-site.  However, explicitly setting $HOME in _vimrc 
means that $HOME is set only when my personal _vimrc is run.  Since $HOME is 
not properly set prior to executing my personal _vimrc, I used VIMINIT to 
ensure that it would be _vimrc be initially executed

   Windows 7 user variable VIMINIT
   -------------------------------
   source %USERPROFILE%\Documents\_vimrc

I'm sure that my $HOME is as expected because changes to _vimrc take place 
right away, e.g.:

   command TEST echo "YES TEST IS WORKING"

Furthermore, :scriptnames shows a number of accesses to files in my personal 
vimfiles directory tree:

  1: C:/Users/MyUserAccount/Documents/_vimrc
  2: C:/Users/MyUserAccount/Documents/vimfiles/colors/mine.vim
  3: C:/Program Files (x86)/Vim/vim73/filetype.vim
  4: C:/Program Files (x86)/Vim/vim73/menu.vim
  5: C:/Program Files (x86)/Vim/vim73/autoload/paste.vim
  6: C:/Program Files (x86)/Vim/vim73/ftplugin.vim
  7: C:/Users/MyUserAccount/Documents/vimfiles/plugin/bufexplorer.vim
  8: C:/Program Files (x86)/Vim/vim73/plugin/getscriptPlugin.vim
  9: C:/Program Files (x86)/Vim/vim73/plugin/gzip.vim
 10: C:/Program Files (x86)/Vim/vim73/plugin/matchparen.vim
 11: C:/Program Files (x86)/Vim/vim73/plugin/netrwPlugin.vim
 12: C:/Program Files (x86)/Vim/vim73/plugin/rrhelper.vim
 13: C:/Program Files (x86)/Vim/vim73/plugin/spellfile.vim
 14: C:/Program Files (x86)/Vim/vim73/plugin/tarPlugin.vim
 15: C:/Program Files (x86)/Vim/vim73/plugin/tohtml.vim
 16: C:/Program Files (x86)/Vim/vim73/plugin/vimballPlugin.vim
 17: C:/Program Files (x86)/Vim/vim73/plugin/zipPlugin.vim
 18: C:/Program Files (x86)/Vim/vim73/ftplugin/tex.vim
 19: C:/Program Files (x86)/Vim/vim73/ftplugin/plaintex.vim
 20: C:/Program Files (x86)/Vim/vim73/ftplugin/initex.vim
 21: C:/Program Files (x86)/Vim/vim73/syntax/syntax.vim
 22: C:/Program Files (x86)/Vim/vim73/syntax/synload.vim
 23: C:/Program Files (x86)/Vim/vim73/colors/blue.vim
 24: C:/Program Files (x86)/Vim/vim73/syntax/syncolor.vim
 25: C:/Program Files (x86)/Vim/vim73/syntax/tex.vim
 26: C:/Program Files (x86)/Vim/vim73/scripts.vim
 27: C:/Program Files (x86)/Vim/vim73/ftplugin/help.vim
 28: C:/Program Files (x86)/Vim/vim73/syntax/help.vim
 29: C:/Program Files (x86)/Vim/vim73/ftplugin/vim.vim
 30: C:/Program Files (x86)/Vim/vim73/syntax/vim.vim
 31: C:/Program Files (x86)/Vim/vim73/autoload/netrw.vim
 32: C:/Users/MyUserAccount/Documents/vimfiles/.netrwhist
 33: C:/Program Files (x86)/Vim/vim73/syntax/netrw.vim

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