title: is there a way to remove FILE_FLAG_DELETE_ON_CLOSE?
body: <p>in my app I'd like to open a temp file with FILE_FLAG_DELETE_ON_CLOSE.  however there are some cases where the temp file needs to be kept and is quite large</p>
  
  <p>I'd like to remove the FILE_FLAG_DELETE_ON_CLOSE attribute on an opened handle?  is this possible?  copying the contents of the file or renaming isnt quite what I want,  I'd like to remove the attribute.  this is due to how i'm transacting some writes, in my app closing the handle will open me up to a race condition</p>