I would like to draw your attention to a bug which is present in the default installation of (at least) FC 12 to 14 when using gnome as DE and alpine as email client.
Description of problem:
The mailer program "alpine" is configured by default to delegate opening of HTTP-references to Firefox (or the gnome default browser) and xdg-open for attachments (HTTP files, but also images, PDF, ...). After a standard installation alpine saves a copy of the file to be displayed as /tmp/img-*, but when it comes to the *final*) delegate application (xdg-open delegates to gnome-open, which delegates *finally* to eog, acroread etc.), the tempfile has already disappeared. An file-missing error is reported by the application. Apparently "alpine" waits for the delegate (It sees only xdg-open!) to stop/SIGCHLD, then removes the tempfile before the final delegates comes to open it.

Version-Release number of selected component (if applicable):
It is more than a single version, but the defaults of FC 12 - FC 14 (at least) show this behaviour.

More details (May 2009):
 http://lists.fedoraproject.org/pipermail/users/2009-March/069261.html
It actually mentions FC 10 showing this problem. (I did not check this version.)

Workaround (April 2011):
 http://lists.fedoraproject.org/pipermail/users/2011-April/396172.html

Expected results:
Establish correct (SIGCHLD / wait?) communication between the delegates (xdg-open, gnome-open) and their callers.

Additional info:
gnome-open is in libgnome-2.16.0-6.el5
xdg-open is in xdg-utils
I cannot identify if only one of them needs to be corrected, but I cannot indicate both components in this bug report form.