openSUSE Linux 12.1/LXDE: Add support for the XZ Utils in Xarchiver.
Downstream patch to add XZ support.:
xarchiver is no longer developed as part of Xfce but at Sourceforge. Please file your request at http://sourceforge.net/tracker/?func=browse&group_id=140153&atid=745600
There already are two bug reports about this
The first one was filed by the author of xarchiver himself, but so far nothing has happened. I am not sure that this bug report will change something.