diff --git a/KNOWN_ISSUES.TXT b/KNOWN_ISSUES.TXT
index 3cedb94..2619ebf 100644
--- a/KNOWN_ISSUES.TXT
+++ b/KNOWN_ISSUES.TXT
@@ -1,5 +1,33 @@
 The following is a list of known issues with MATE on Slackware:
 
+Mon Jun 10 03:09:28 UTC 2013
+If you are encountering problems with Caja (MATE's file manager) opening
+directories when clicking on files in certain programs like Dropbox, Skype,
+and others, the problem is that xdg-open (part of Slackware's xdg-utils
+package) does not recognize the MATE desktop and therefore defaults to opening
+the directories in Firefox.  Fixes for this have been committed to xdg-utils
+upstream development in Git but for now, we must apply a patch to xdg-open and
+add some xdg-mime default handlers.
+
+First, as a root user, back up /usr/bin/xdg-open and then apply the
+xdg-open.patch from msb/testing/xdg-utils:
+
+patch -p0 /usr/bin/xdg-open < /location/of/xdg-open.patch
+
+Then, as your regular user, first back up the following file:
+$HOME/.local/share/applications/defaults.list and then enter the next two
+commands in a terminal to set the default handler:
+
+xdg-mime default caja-folder-handler.desktop inode/directory
+xdg-mime default caja-folder-handler.desktop application/x-directory
+
+You should be all set.  Thanks to Totoro-kun and T3slider for reporting and
+discussing this in the LQ forums and also thanks to Giorgos Keramidas for
+creating the initial patch.  Here is a link to the LQ thread which also has a
+link to Giorgos's blog with the patch:
+
+http://www.linuxquestions.org/questions/showthread.php?p=4968614
+
 Wed Mar 27 04:23:24 UTC 2013
 If you have dual monitor with NVidia card and set it up to use both monitors
 as separate, you might encounter some freeze lockup.  A temporary workaround
diff --git a/testing/xdg-utils/xdg-open.patch b/testing/xdg-utils/xdg-open.patch
new file mode 100644
index 0000000..4f37b34
--- /dev/null
+++ b/testing/xdg-utils/xdg-open.patch
@@ -0,0 +1,43 @@
+--- /usr/bin/xdg-open.orig	2013-06-09 22:35:07.143009464 -0400
++++ /usr/bin/xdg-open	2013-06-09 23:00:59.408950087 -0400
+@@ -308,6 +308,7 @@ detectDE()
+     elif `dbus-send --print-reply --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.GetNameOwner string:org.gnome.SessionManager > /dev/null 2>&1` ; then DE=gnome;
+     elif xprop -root _DT_SAVE_MODE 2> /dev/null | grep ' = \"xfce4\"$' >/dev/null 2>&1; then DE=xfce;
+     elif [ x"$DESKTOP_SESSION" == x"LXDE" ]; then DE=lxde;
++    elif [ x"$DESKTOP_SESSION" == x"mate" ]; then DE=mate;
+     else DE=""
+     fi
+ }
+@@ -371,6 +372,21 @@ open_gnome()
+     fi
+ }
+ 
++open_mate()
++{
++    if gvfs-open --help 2>/dev/null 1>&2; then
++        gvfs-open "$1"
++    else
++        mate-open "$1"
++    fi
++
++    if [ $? -eq 0 ]; then
++        exit_success
++    else
++        exit_failure_operation_failed
++    fi
++}
++
+ open_xfce()
+ {
+     exo-open "$1"
+@@ -539,6 +555,10 @@ case "$DE" in
+     open_gnome "$url"
+     ;;
+ 
++    mate)
++    open_mate "$url"
++    ;;
++
+     xfce)
+     open_xfce "$url"
+     ;;