After installing the Java 6 RPM on Fedora Core (jdk-1.6.0-fcs), Nautilus prints the following error when you try to open an OpenOffice document:

The filename "Report.sxw" indicates that this file is of type "OpenOffice Writer". The contents of the file indicate that the file is of type "Java Archive". If you open this file, the file might present a security risk to your system.

This is because the file /usr/share/mime/packages/x-java-archive.xml that is created by the Java RPM is broken. To fix it, add a "<" in front of the second "match" tag:

--- x-java-archive.xml.orig     2006-12-24 14:47:05.000000000 +0100
+++ x-java-archive.xml  2006-12-25 11:57:03.000000000 +0100
@@ -32,7 +32,7 @@
     <glob pattern="*.jar"/>
     <magic priority="85">
       <match type="string" value="PK\003\004" offset="0">
-       match type="host16" value="0xcafe" offset="40" />
+       <match type="host16" value="0xcafe" offset="40" />
       </match>
     </magic>
   </mime-type>

Then run the following command:

update-mime-database /usr/share/mime

Log out and log in again to restart Nautilus.

Update 12 Jan 2007: This has been filed as ticket 6510610 in Sun's Bug Database.

Update 7 Jul 2007: The bug has been fixed in Java 6 Update 2.

A while back I bought an iriver T10 music player. For the next months, I had to use gPhoto to upload audio files from Linux to the T10. Only because someone decided to use Microsoft's Media Transfer Protocol (MTP), instead of the good old USB Mass Storage protocol (UMS).

My gPhoto setup broke when I upgraded to Fedora Core 6, so I searched around, and found that iriver had released new firmware to replace MTP with UMS. The firmware updater requires Windows to run, but after using it, I finally can access the T10 like any other USB storage device under Linux.