for example i have a zip file in a dir called
/mnt/data/stud/uebungen/[DONE] - ps2/05-done/ueb09-done
when i try to open the zip, xarchiver segfaults with this bt:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1218038080 (LWP 18983)]
0xb79392cb in strlen () from /lib/libc.so.6
(gdb) bt
#0  0xb79392cb in strlen () from /lib/libc.so.6
#1  0xb7a3f45e in g_strdup () from /usr/lib/libglib-2.0.so.0
#2  0xb7ac25ca in value_collect_string () from /usr/lib/libgobject-2.0.so.0
#3  0xb7d6a538 in gtk_list_store_set_valist_internal ()
   from /usr/lib/libgtk-x11-2.0.so.0
#4  0xb7d6bd00 in gtk_list_store_set_valist ()
   from /usr/lib/libgtk-x11-2.0.so.0
#5  0xb7d6bd72 in gtk_list_store_set () from /usr/lib/libgtk-x11-2.0.so.0
#6  0x0805c7d3 in ZipOpen ()
#7  0xb7a4e06f in g_io_unix_dispatch () from /usr/lib/libglib-2.0.so.0
#8  0xb7a24ac1 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#9  0xb7a27b1f in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#10 0xb7a27ed7 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#11 0xb7d6e1e1 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#12 0x0804fee2 in main ()

a tar.gz file i tested works fine.
when i rename the dir so there are no [] chars in the path, the file can be opened correctly.