" Only apply to .txt files...
augroup HelpInTabs
    autocmd!
    autocmd BufEnter  *.txt   call HelpInNewTab()
augroup END

" Only apply to help files...
function! HelpInNewTab ()
    if &buftype == 'help' && g:help_in_tabs
        "Convert the help window to a tab...
        execute "normal \<C-W>T"
    endif
endfunction

let g:help_in_tabs = 0