When you open a file and try to remove a file inside of it, it dies with a segmentation fault.
Reproductible (always):
1) Open a file (tar.gz for example)
2) select a file inside of it
3) Click on remove. Give "Yes".

It dies...

Backtrace:

(gdb) run
Starting program: /usr/bin/squeeze
[Thread debugging using libthread_db enabled]
[New Thread -1219421824 (LWP 25225)]
[New Thread -1224905808 (LWP 25229)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1219421824 (LWP 25225)]
0xb7ed8f7c in thunar_vfs_mime_info_lookup_icon_name ()
   from /usr/lib/libthunar-vfs-1.so.2
(gdb) bt
#0  0xb7ed8f7c in thunar_vfs_mime_info_lookup_icon_name ()
   from /usr/lib/libthunar-vfs-1.so.2
#1  0xb7ef1594 in lsq_archive_iter_get_icon_name (archive=0x80e5d50,
    iter=0x809a510, value=0xbfd5c840, icon_theme=0x807cf40) at archive.c:1612
#2  0xb7d064d8 in gtk_tree_model_get_value () from /usr/lib/libgtk-x11-2.0.so.0
#3  0xb7d372d9 in gtk_tree_view_column_cell_set_cell_data ()
   from /usr/lib/libgtk-x11-2.0.so.0
#4  0xbfd5cac0 in ?? ()
#5  0x00000000 in ?? ()
(gdb)