Windows – How to prevent a VIM file from becoming read-only when edited via a Windows symbolic link

The option you're looking for is 'complete', but it doesn't define the granularity you're asking for. All you can do is specify whether or not to scan included files. To disable scanning of all included files, you can

set complete-=i

Otherwise, setting 'include' to ignore boost may be your best option.

set include=^\\s*#\\s*include\ \\(<boost/\\)\\@!

Note that, as I mentioned in my other comment, you shouldn't use " to specify the option as that is Vim's comment character. Instead, you need to escape the spaces.

This bug was fixed in 7.3.1182. Vim 7.4 is the first release on vim.org to include this patch (released 2013-08-10).

To support older versions of vim, you can use something like this in your vimrc:

" Writing files on Windows doesn't preserve file attributes seen via cygwin
" (presumably because the created backup copy didn't inherit them correctly).
if has('win32') && v:version < 704
    set backupcopy=yes
endif