||Check if the file is complete and if it's the case, write file attributes
||applefile definitions used
||mostly copy/pasted from nsMacShellService.cpp (which is in browser/,
so we can't depend on it here). This code probably really wants to live
somewhere more central (see bug 389922).
||This is an undocumented interface (in the Foundation framework) that has
been stable since at least 10.2.8 and is still present on SnowLeopard.
Furthermore WebKit has three public methods (in WebKitSystemInterface.h)
that are thin wrappers around this interface's last three methods. So
it's unlikely to change anytime soon. Now that we're no longer using
Internet Config Services, this is the only way to look up a MIME type
from an extension, or vice versa.