heres the output :P

~ $ root


BusyBox v1.20.2 (Debian 1.20.2power2) built-in shell (ash)
Enter 'help' for a list of built-in commands.

Nokia-N900:~# apt-get purge xarchiver
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
xarchiver*
0 upgraded, 0 newly installed, 1 to remove and 3 not upgraded.
After this operation, 1212kB disk space will be freed.
Do you want to continue [Y/n]? y
(Reading database ... 36023 files and directories currently installed.)
Removing xarchiver ...
Unknown media type in type 'sketch/png'

Purging configuration files for xarchiver ...
Processing triggers for catoriseplus ...
################################################## #############################################
Nokia-N900:~# apt-get install xarchiver
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
xarchiver
0 upgraded, 1 newly installed, 0 to remove and 3 not upgraded.
Need to get 0B/384kB of archives.
After this operation, 410kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
xarchiver
Install these packages without verification [y/N]? y
Selecting previously deselected package xarchiver.
(Reading database ... 35955 files and directories currently installed.)
Unpacking xarchiver (from .../xarchiver_0.4.6-7maemo2_all.deb) ...
Processing triggers for catoriseplus ...
################################################## ##############################################
Setting up xarchiver (0.4.6-7maemo2) ...
Unknown media type in type 'sketch/png'

/var/lib/dpkg/info/xarchiver.postinst: line 39: maemo-select-menu-location: not found
Nokia-N900:~#

(everything doesn't look right for me )