diff -uNr xarchiver-0.5.2.orig/src/add_dialog.c xarchiver-0.5.2/src/add_dialog.c
--- xarchiver-0.5.2.orig/src/add_dialog.c	2008-11-10 19:41:31.000000000 +0900
+++ xarchiver-0.5.2/src/add_dialog.c	2013-05-11 10:01:47.887094708 +0900
@@ -209,7 +209,7 @@
 	else
 		gtk_widget_set_size_request (add_dialog->dialog1,530,420);
 
-	if (archive->type == XARCHIVETYPE_BZIP2 || archive->type == XARCHIVETYPE_GZIP || archive->type == XARCHIVETYPE_LZMA || archive->type == XARCHIVETYPE_LZOP)
+	if (archive->type == XARCHIVETYPE_BZIP2 || archive->type == XARCHIVETYPE_GZIP || archive->type == XARCHIVETYPE_LZMA || archive->type == XARCHIVETYPE_XZ || archive->type == XARCHIVETYPE_LZOP)
 		gtk_file_chooser_set_select_multiple(GTK_FILE_CHOOSER(add_dialog->filechooserwidget1),FALSE);
 	else
 		gtk_file_chooser_set_select_multiple(GTK_FILE_CHOOSER(add_dialog->filechooserwidget1),TRUE);
@@ -222,7 +222,7 @@
 	else
 		gtk_widget_set_sensitive(add_dialog->store_path,TRUE);
 	/* 7z doesn't appear to let the user chooses if storing full paths */
-	if (archive->type == XARCHIVETYPE_7ZIP || archive->type == XARCHIVETYPE_LZOP || archive->type == XARCHIVETYPE_BZIP2 || archive->type == XARCHIVETYPE_GZIP || archive->type == XARCHIVETYPE_LZMA)
+	if (archive->type == XARCHIVETYPE_7ZIP || archive->type == XARCHIVETYPE_LZOP || archive->type == XARCHIVETYPE_BZIP2 || archive->type == XARCHIVETYPE_GZIP || archive->type == XARCHIVETYPE_LZMA || archive->type == XARCHIVETYPE_XZ )
  	{
  		flag = FALSE;
 	}
@@ -244,7 +244,7 @@
 		flag = TRUE;
 	gtk_widget_set_sensitive(add_dialog->solid_archive,flag);
 	
-	if (archive->type != XARCHIVETYPE_TAR && archive->type != XARCHIVETYPE_TAR_GZ && archive->type != XARCHIVETYPE_TAR_LZMA && archive->type != XARCHIVETYPE_TAR_BZ2 && archive->type != XARCHIVETYPE_TAR_LZOP)
+	if (archive->type != XARCHIVETYPE_TAR && archive->type != XARCHIVETYPE_TAR_GZ && archive->type != XARCHIVETYPE_TAR_LZMA && archive->type != XARCHIVETYPE_TAR_XZ && archive->type != XARCHIVETYPE_TAR_BZ2 && archive->type != XARCHIVETYPE_TAR_LZOP)
 	{
 		flag = TRUE;
 		if (archive->type == XARCHIVETYPE_7ZIP)
@@ -306,7 +306,7 @@
 		g_signal_connect (G_OBJECT (add_dialog->compression_value),"value-changed",G_CALLBACK (fix_adjustment_value), NULL);
 	gtk_tooltips_set_tip (add_dialog->option_tooltip,add_dialog->compression_scale, compression_msg, NULL );
 
-	if (archive->type == XARCHIVETYPE_TAR || archive->type == XARCHIVETYPE_TAR_GZ || archive->type == XARCHIVETYPE_TAR_LZMA || archive->type == XARCHIVETYPE_TAR_BZ2 || archive->type == XARCHIVETYPE_TAR_LZOP)
+	if (archive->type == XARCHIVETYPE_TAR || archive->type == XARCHIVETYPE_TAR_GZ || archive->type == XARCHIVETYPE_TAR_LZMA || archive->type == XARCHIVETYPE_TAR_XZ || archive->type == XARCHIVETYPE_TAR_BZ2 || archive->type == XARCHIVETYPE_TAR_LZOP)
 		flag = FALSE;
 	else
 		flag = TRUE;
diff -uNr xarchiver-0.5.2.orig/src/archive.h xarchiver-0.5.2/src/archive.h
--- xarchiver-0.5.2.orig/src/archive.h	2008-11-07 17:49:41.000000000 +0900
+++ xarchiver-0.5.2/src/archive.h	2013-05-11 10:01:47.888094708 +0900
@@ -30,6 +30,7 @@
 	XARCHIVETYPE_BZIP2,
 	XARCHIVETYPE_GZIP,
 	XARCHIVETYPE_LZMA,
+	XARCHIVETYPE_XZ,
 	XARCHIVETYPE_LZOP,
 	XARCHIVETYPE_RAR,
 	XARCHIVETYPE_RPM,
@@ -37,6 +38,7 @@
 	XARCHIVETYPE_TAR_BZ2,
 	XARCHIVETYPE_TAR_GZ,
 	XARCHIVETYPE_TAR_LZMA,
+	XARCHIVETYPE_TAR_XZ,
 	XARCHIVETYPE_TAR_LZOP,
 	XARCHIVETYPE_ZIP,
 	XARCHIVETYPE_LHA,
diff -uNr xarchiver-0.5.2.orig/src/bzip2.c xarchiver-0.5.2/src/bzip2.c
--- xarchiver-0.5.2.orig/src/bzip2.c	2008-11-10 20:17:48.000000000 +0900
+++ xarchiver-0.5.2/src/bzip2.c	2013-05-11 10:01:47.888094708 +0900
@@ -54,6 +54,15 @@
 		archive->extract = 	extract[archive->type];
 		xa_open_tar_compressed_file(archive);
 	}
+	else if (g_str_has_suffix(archive->escaped_path,".tar.xz") || g_str_has_suffix (archive->escaped_path,".txz"))
+	{
+		archive->type = XARCHIVETYPE_TAR_XZ;
+		archive->format = "TAR.XZ";
+		archive->delete =	delete[archive->type];
+		archive->add = 		add[archive->type];
+		archive->extract = 	extract[archive->type];
+		xa_open_tar_compressed_file(archive);
+	}
 	else if (g_str_has_suffix(archive->escaped_path,".tar.lzop") ||
 		g_str_has_suffix (archive->escaped_path,".tzo") ||
 		g_str_has_suffix(archive->escaped_path,".tar.lzo"))
@@ -85,6 +94,12 @@
 			executable = "lzma ";
 			len = 5;
 		}
+		else if (archive->type == XARCHIVETYPE_XZ)
+		{
+			archive->format = "XZ";
+			executable = "xz ";
+			len = 5;
+		}
 		else if (archive->type == XARCHIVETYPE_LZOP)
 		{
 			archive->format = "LZOP";
@@ -163,6 +178,8 @@
 		command = g_strconcat(tar," tfjv ",archive->escaped_path,NULL);
 	else if (archive->type == XARCHIVETYPE_TAR_LZMA)
 		command = g_strconcat(tar," tv --use-compress-program=lzma -f ",archive->escaped_path,NULL);
+	else if (archive->type == XARCHIVETYPE_TAR_XZ)
+		command = g_strconcat(tar," tv --use-compress-program=xz -f ",archive->escaped_path,NULL);
 	else if (archive->type == XARCHIVETYPE_TAR_LZOP)
 		command = g_strconcat(tar," tv --use-compress-program=lzop -f ",archive->escaped_path,NULL);
 	/* else fail? */
@@ -205,6 +222,11 @@
 		executable = "lzma ";
 		len = 5;
 	}
+	else if (archive->type == XARCHIVETYPE_XZ)
+	{
+		executable = "xz ";
+		len = 5;
+	}
 	else if (archive->type == XARCHIVETYPE_LZOP)
 	{
 		executable = "lzop ";
diff -uNr xarchiver-0.5.2.orig/src/extract_dialog.c xarchiver-0.5.2/src/extract_dialog.c
--- xarchiver-0.5.2.orig/src/extract_dialog.c	2008-11-10 19:28:11.000000000 +0900
+++ xarchiver-0.5.2/src/extract_dialog.c	2013-05-11 10:01:47.889094708 +0900
@@ -815,6 +815,11 @@
 		archive->type = XARCHIVETYPE_TAR_LZMA;
 		archive->extract = 	extract[XARCHIVETYPE_TAR_LZMA];
 	}
+	else if (g_str_has_suffix(archive->escaped_path,".tar.xz")|| g_str_has_suffix (archive->escaped_path,".txz"))
+	{
+		archive->type = XARCHIVETYPE_TAR_XZ;
+		archive->extract = 	extract[XARCHIVETYPE_TAR_XZ];
+	}
 	else if (g_str_has_suffix(archive->escaped_path,".tar.lzop") ||
 			g_str_has_suffix (archive->escaped_path,".tzo") ||
 			g_str_has_suffix(archive->escaped_path,".tar.lzo"))
diff -uNr xarchiver-0.5.2.orig/src/main.c xarchiver-0.5.2/src/main.c
--- xarchiver-0.5.2.orig/src/main.c	2008-11-10 20:21:43.000000000 +0900
+++ xarchiver-0.5.2/src/main.c	2013-05-11 10:17:01.696094044 +0900
@@ -296,9 +296,10 @@
 	open_archive[XARCHIVETYPE_BZIP2]  = &xa_open_bzip2_lzma;
 	open_archive[XARCHIVETYPE_GZIP]  = &xa_open_gzip;
 	open_archive[XARCHIVETYPE_LZMA]  = &xa_open_bzip2_lzma;
+	open_archive[XARCHIVETYPE_XZ]  = &xa_open_bzip2_lzma;
 	open_archive[XARCHIVETYPE_RAR]  = &xa_open_rar;
 	open_archive[XARCHIVETYPE_RPM]  = &xa_open_rpm;
-	open_archive[XARCHIVETYPE_TAR]  = open_archive[XARCHIVETYPE_TAR_BZ2] = open_archive[XARCHIVETYPE_TAR_GZ] = open_archive[XARCHIVETYPE_TAR_LZMA] = open_archive[XARCHIVETYPE_TAR_LZOP] = &xa_open_tar;
+	open_archive[XARCHIVETYPE_TAR]  = open_archive[XARCHIVETYPE_TAR_BZ2] = open_archive[XARCHIVETYPE_TAR_GZ] = open_archive[XARCHIVETYPE_TAR_LZMA] = open_archive[XARCHIVETYPE_TAR_XZ] = open_archive[XARCHIVETYPE_TAR_LZOP] = &xa_open_tar;
 	open_archive[XARCHIVETYPE_ZIP] = &xa_open_zip;
 	open_archive[XARCHIVETYPE_LHA] = &xa_open_lha;
 	open_archive[XARCHIVETYPE_LZOP] = &xa_open_bzip2_lzma;
@@ -310,9 +311,10 @@
 	delete[XARCHIVETYPE_BZIP2]  = 0;
 	delete[XARCHIVETYPE_GZIP]  = 0;
 	delete[XARCHIVETYPE_LZMA]  = 0;
+	delete[XARCHIVETYPE_XZ]  = 0;
 	delete[XARCHIVETYPE_RAR]  = &xa_rar_delete;
 	delete[XARCHIVETYPE_RPM]  = 0;
-	delete[XARCHIVETYPE_TAR]  = delete[XARCHIVETYPE_TAR_BZ2] = delete[XARCHIVETYPE_TAR_GZ] = delete[XARCHIVETYPE_TAR_LZMA] = delete[XARCHIVETYPE_TAR_LZOP] = &xa_tar_delete;
+	delete[XARCHIVETYPE_TAR]  = delete[XARCHIVETYPE_TAR_BZ2] = delete[XARCHIVETYPE_TAR_GZ] = delete[XARCHIVETYPE_TAR_LZMA] = delete[XARCHIVETYPE_TAR_XZ] = delete[XARCHIVETYPE_TAR_LZOP] = &xa_tar_delete;
 	delete[XARCHIVETYPE_ZIP] = &xa_zip_delete;
 	delete[XARCHIVETYPE_LHA] = &xa_lha_delete;
 	delete[XARCHIVETYPE_LZOP] = 0;
@@ -322,10 +324,10 @@
 	add[XARCHIVETYPE_7ZIP]  = &xa_7zip_add;
 	add[XARCHIVETYPE_ARJ]  = &xa_arj_add;
 	add[XARCHIVETYPE_DEB]  = 0;
-	add[XARCHIVETYPE_BZIP2]  = add[XARCHIVETYPE_GZIP] = add[XARCHIVETYPE_LZMA] = &xa_tar_add;
+	add[XARCHIVETYPE_BZIP2]  = add[XARCHIVETYPE_GZIP] = add[XARCHIVETYPE_LZMA] = add[XARCHIVETYPE_XZ] = &xa_tar_add;
 	add[XARCHIVETYPE_RAR]  = &xa_rar_add;
 	add[XARCHIVETYPE_RPM]  = 0;
-	add[XARCHIVETYPE_TAR]  = add[XARCHIVETYPE_TAR_BZ2] = add[XARCHIVETYPE_TAR_GZ] = add[XARCHIVETYPE_TAR_LZMA] = add[XARCHIVETYPE_TAR_LZOP] = &xa_tar_add;
+	add[XARCHIVETYPE_TAR]  = add[XARCHIVETYPE_TAR_BZ2] = add[XARCHIVETYPE_TAR_GZ] = add[XARCHIVETYPE_TAR_LZMA] = add[XARCHIVETYPE_TAR_XZ] = add[XARCHIVETYPE_TAR_LZOP] = &xa_tar_add;
 	add[XARCHIVETYPE_ZIP] = &xa_zip_add;
 	add[XARCHIVETYPE_LHA] = &xa_lha_add;
 	add[XARCHIVETYPE_LZOP] = &xa_tar_add;
@@ -334,10 +336,10 @@
 	extract[XARCHIVETYPE_7ZIP]  = &xa_7zip_extract;
 	extract[XARCHIVETYPE_ARJ]  = &xa_arj_extract;
 	extract[XARCHIVETYPE_DEB]  = &xa_deb_extract;;
-	extract[XARCHIVETYPE_BZIP2]  = extract[XARCHIVETYPE_GZIP] = extract[XARCHIVETYPE_LZMA] = &xa_tar_extract;
+	extract[XARCHIVETYPE_BZIP2]  = extract[XARCHIVETYPE_GZIP] = extract[XARCHIVETYPE_LZMA] = extract[XARCHIVETYPE_XZ] = &xa_tar_extract;
 	extract[XARCHIVETYPE_RAR]  = &xa_rar_extract;
 	extract[XARCHIVETYPE_RPM]  = &xa_rpm_extract;
-	extract[XARCHIVETYPE_TAR]  = extract[XARCHIVETYPE_TAR_BZ2] = extract[XARCHIVETYPE_TAR_GZ] = extract[XARCHIVETYPE_TAR_LZMA] = extract[XARCHIVETYPE_TAR_LZOP] = &xa_tar_extract;
+	extract[XARCHIVETYPE_TAR]  = extract[XARCHIVETYPE_TAR_BZ2] = extract[XARCHIVETYPE_TAR_GZ] = extract[XARCHIVETYPE_TAR_LZMA] = extract[XARCHIVETYPE_TAR_XZ] = extract[XARCHIVETYPE_TAR_LZOP] = &xa_tar_extract;
 	extract[XARCHIVETYPE_ZIP] = &xa_zip_extract;
 	extract[XARCHIVETYPE_LHA] = &xa_lha_extract;
 	extract[XARCHIVETYPE_LZOP] = &xa_tar_extract;
@@ -345,10 +347,10 @@
 	test[0]  = 0;
 	test[XARCHIVETYPE_7ZIP]  = &xa_7zip_test;
 	test[XARCHIVETYPE_ARJ]  = &xa_arj_test;
-	test[XARCHIVETYPE_DEB]  = test[XARCHIVETYPE_BZIP2] = test[XARCHIVETYPE_GZIP] = test[XARCHIVETYPE_LZMA] = 0;
+	test[XARCHIVETYPE_DEB]  = test[XARCHIVETYPE_BZIP2] = test[XARCHIVETYPE_GZIP] = test[XARCHIVETYPE_LZMA] = test[XARCHIVETYPE_XZ] = 0;
 	test[XARCHIVETYPE_RAR]  = &xa_rar_test;
 	test[XARCHIVETYPE_RPM]  = 0;
-	test[XARCHIVETYPE_TAR]  = test[XARCHIVETYPE_TAR_BZ2] = test[XARCHIVETYPE_TAR_GZ] = test[XARCHIVETYPE_TAR_LZMA] = test[XARCHIVETYPE_TAR_LZOP] = 0;
+	test[XARCHIVETYPE_TAR]  = test[XARCHIVETYPE_TAR_BZ2] = test[XARCHIVETYPE_TAR_GZ] = test[XARCHIVETYPE_TAR_LZMA] = test[XARCHIVETYPE_TAR_XZ] = test[XARCHIVETYPE_TAR_LZOP] = 0;
 	test[XARCHIVETYPE_ZIP] = &xa_zip_test;
 	test[XARCHIVETYPE_LHA] = &xa_lha_test;
 	test[XARCHIVETYPE_LZOP] = 0;
@@ -392,6 +394,14 @@
 		g_free (absolute_path);
 	}
 
+	absolute_path = g_find_program_in_path("xz");
+	if ( absolute_path )
+	{
+		ArchiveType = g_list_append(ArchiveType, "xz");
+		ArchiveSuffix = g_list_append(ArchiveSuffix, "*.xz");
+		g_free (absolute_path);
+	}
+
 	absolute_path = g_find_program_in_path("lzop");
 	if ( absolute_path )
 	{
@@ -460,6 +470,11 @@
 			ArchiveType = g_list_append(ArchiveType, "tar.lzma");
 			ArchiveSuffix = g_list_append(ArchiveSuffix, "*.tlz");
 		}
+		if ( g_list_find ( ArchiveType , "xz") )
+		{
+			ArchiveType = g_list_append(ArchiveType, "tar.xz");
+			ArchiveSuffix = g_list_append(ArchiveSuffix, "*.txz");
+		}
 		if ( g_list_find ( ArchiveType , "lzo") )
 		{
 			ArchiveType = g_list_append(ArchiveType, "tar.lzo");
@@ -528,6 +543,8 @@
 		archive->type = XARCHIVETYPE_TAR_GZ;
 	else if ( g_str_has_suffix ( archive->escaped_path , ".tar.lzma") || g_str_has_suffix ( archive->escaped_path , ".tlz") )
 		archive->type = XARCHIVETYPE_TAR_LZMA;
+	else if ( g_str_has_suffix ( archive->escaped_path , ".tar.xz") || g_str_has_suffix ( archive->escaped_path , ".txz") )
+		archive->type = XARCHIVETYPE_TAR_XZ;
 	else if ( g_str_has_suffix ( archive->escaped_path , ".tar.lzo") ||
 		g_str_has_suffix ( archive->escaped_path , ".tzo") ||
 		g_str_has_suffix ( archive->escaped_path , ".tar.lzop"))
diff -uNr xarchiver-0.5.2.orig/src/new_dialog.c xarchiver-0.5.2/src/new_dialog.c
--- xarchiver-0.5.2.orig/src/new_dialog.c	2008-11-11 17:28:46.000000000 +0900
+++ xarchiver-0.5.2/src/new_dialog.c	2013-05-11 10:01:47.890094708 +0900
@@ -202,6 +202,8 @@
 			type = XARCHIVETYPE_GZIP;
 		else if (strcmp ( ComboArchiveType,"lzma") == 0)
 			type = XARCHIVETYPE_LZMA;
+		else if (strcmp ( ComboArchiveType,"xz") == 0)
+			type = XARCHIVETYPE_XZ;
 		else if (strcmp ( ComboArchiveType,"lzo") == 0)
 			type = XARCHIVETYPE_LZOP;
 		else if (strcmp ( ComboArchiveType,"rar") == 0)
@@ -214,6 +216,8 @@
 			type = XARCHIVETYPE_TAR_GZ;
 		else if (strcmp ( ComboArchiveType,"tar.lzma") == 0)
 			type = XARCHIVETYPE_TAR_LZMA;
+		else if (strcmp ( ComboArchiveType,"tar.xz") == 0)
+			type = XARCHIVETYPE_TAR_XZ;
 		else if (strcmp ( ComboArchiveType,"tar.lzo") == 0)
 			type = XARCHIVETYPE_TAR_LZOP;
 		else if (strcmp ( ComboArchiveType,"jar") == 0 || strcmp ( ComboArchiveType,"zip") == 0 )
diff -Naur xarchiver-0.5.2.orig/src/rpm.c xarchiver-0.5.2/src/rpm.c
--- xarchiver-0.5.2.orig/src/rpm.c	2014-01-24 03:07:47.729711000 +0100
+++ xarchiver-0.5.2/src/rpm.c	2014-01-24 03:12:43.717122918 +0100
@@ -111,8 +111,10 @@
 	}
 	if (xa_detect_archive_type (gzip_tmp) == XARCHIVETYPE_GZIP)
 		executable = "gzip -dc ";
-	else
+	else if (xa_detect_archive_type (gzip_tmp) == XARCHIVETYPE_BZIP2)
 		executable = "bzip2 -dc ";
+	else
+		executable = "xz -dc ";
 
 	command = g_strconcat("sh -c \"",executable,gzip_tmp," > ",archive->tmp,"/file.cpio\"",NULL);
 	g_free(gzip_tmp);diff -uNr xarchiver-0.5.2.orig/src/tar.c xarchiver-0.5.2/src/tar.c
--- xarchiver-0.5.2.orig/src/tar.c	2008-11-10 19:28:34.000000000 +0900
+++ xarchiver-0.5.2/src/tar.c	2013-05-11 10:12:01.027094262 +0900
@@ -242,6 +242,17 @@
 									files->str , NULL );
 		break;
 		
+		case XARCHIVETYPE_TAR_XZ:
+		if ( g_file_test ( archive->escaped_path , G_FILE_TEST_EXISTS ) )
+			xa_add_delete_bzip2_gzip_lzma_compressed_tar (files,archive,1);
+		else
+			command = g_strconcat (tar, " ",
+									archive->add_recurse ? "" : "--no-recursion ",
+									archive->remove_files ? "--remove-files " : "",
+									"--use-compress-program=xz -cvvf ",archive->escaped_path,
+									files->str , NULL );
+		break;
+		
 		case XARCHIVETYPE_TAR_LZOP:
 		if ( g_file_test ( archive->escaped_path , G_FILE_TEST_EXISTS ) )
 			xa_add_delete_bzip2_gzip_lzma_compressed_tar (files,archive,1);
@@ -265,6 +276,10 @@
 			command = g_strconcat("sh -c \"lzma -c ",files->str,"> ",archive->escaped_path,"\"",NULL);
 		break;
 
+		case XARCHIVETYPE_XZ:
+			command = g_strconcat("sh -c \"xz -c ",files->str,"> ",archive->escaped_path,"\"",NULL);
+		break;
+
 		case XARCHIVETYPE_LZOP:
 			command = g_strconcat("sh -c \"lzop -c ",files->str,"> ",archive->escaped_path,"\"",NULL);
 		break;
@@ -378,6 +393,25 @@
 		}
 		break;
 
+		case XARCHIVETYPE_TAR_XZ:
+		if (archive->full_path == 1)
+		{
+			command = g_strconcat (tar, " --use-compress-program=xz -xvf " , archive->escaped_path,
+						#ifdef __FreeBSD__
+								archive->overwrite ? " " : " -k",
+						#else
+								archive->overwrite ? " --overwrite" : " --keep-old-files",
+						#endif
+								archive->tar_touch ? " --touch" : "",
+								" -C ",archive->extraction_path," ",names->str,NULL);
+		}
+		else
+		{
+			result = xa_extract_tar_without_directories ( "tar --use-compress-program=xz -xvf ",archive,names->str);
+			command = NULL;
+		}
+		break;
+
 		case XARCHIVETYPE_TAR_LZOP:
 		if (archive->full_path == 1)
 		{
@@ -402,6 +436,11 @@
 		command = NULL;
 		break;
 
+		case XARCHIVETYPE_XZ:
+		result = lzma_bzip2_extract(archive,NULL);
+		command = NULL;
+		break;
+
 		case XARCHIVETYPE_LZOP:
 		result = lzma_bzip2_extract(archive,NULL);
 		command = NULL;
@@ -449,6 +488,10 @@
 			executable = "lzma -f ";
 			filename = "dummy.lzma";
 		break;
+		case XARCHIVETYPE_TAR_XZ:
+			executable = "xz -f ";
+			filename = "dummy.xz";
+		break;
 		case XARCHIVETYPE_TAR_LZOP:
 			executable = "lzop -f ";
 			filename = "dummy.lzo";
@@ -493,7 +536,7 @@
 
 gboolean is_tar_compressed (gint type)
 {
-	return (type == XARCHIVETYPE_TAR_BZ2 || type == XARCHIVETYPE_TAR_GZ || type == XARCHIVETYPE_TAR_LZMA || type == XARCHIVETYPE_TAR_LZOP);
+	return (type == XARCHIVETYPE_TAR_BZ2 || type == XARCHIVETYPE_TAR_GZ || type == XARCHIVETYPE_TAR_LZMA || type == XARCHIVETYPE_TAR_XZ || type == XARCHIVETYPE_TAR_LZOP);
 }
 
 gboolean xa_extract_tar_without_directories (gchar *string,XArchive *archive,gchar *files_to_extract)
diff -uNr xarchiver-0.5.2.orig/src/window.c xarchiver-0.5.2/src/window.c
--- xarchiver-0.5.2.orig/src/window.c	2008-11-11 17:31:45.000000000 +0900
+++ xarchiver-0.5.2/src/window.c	2013-05-11 10:01:47.892094708 +0900
@@ -1125,6 +1125,8 @@
 		xx = XARCHIVETYPE_GZIP;
 	else if (memcmp ( magic,"\x5d\x00\x00\x80",4) == 0)
 		xx = XARCHIVETYPE_LZMA;
+	else if ((memcmp ( magic,"\xFD" "7zXZ\x00\x00",7) == 0) || (memcmp ( magic,"\xFD" "7zXZ\x00\x10",7) == 0))
+		xx = XARCHIVETYPE_XZ;
 	else if (memcmp ( magic,"\211LZO",4) == 0)
 		xx = XARCHIVETYPE_LZOP;
 	else if (memcmp ( magic,"\xed\xab\xee\xdb",4) == 0)
@@ -1462,6 +1464,7 @@
 		case XARCHIVETYPE_GZIP:
 		case XARCHIVETYPE_BZIP2:
 		case XARCHIVETYPE_LZMA:
+		case XARCHIVETYPE_XZ:
 		case XARCHIVETYPE_LZOP:
 		case XARCHIVETYPE_RPM:
 		pos = 3;
@@ -1481,6 +1484,7 @@
 		case XARCHIVETYPE_TAR_GZ:
 		case XARCHIVETYPE_TAR_BZ2:
 		case XARCHIVETYPE_TAR_LZMA:
+		case XARCHIVETYPE_TAR_XZ:
 		case XARCHIVETYPE_TAR_LZOP:
 		case XARCHIVETYPE_TAR:
 		case XARCHIVETYPE_ZIP:
@@ -1525,6 +1529,7 @@
 		case XARCHIVETYPE_GZIP:
 		case XARCHIVETYPE_BZIP2:
 		case XARCHIVETYPE_LZMA:
+		case XARCHIVETYPE_XZ:
 		case XARCHIVETYPE_LZOP:
 		case XARCHIVETYPE_RPM:
 		pos = 3;
@@ -1544,6 +1549,7 @@
 		case XARCHIVETYPE_TAR_GZ:
 		case XARCHIVETYPE_TAR_BZ2:
 		case XARCHIVETYPE_TAR_LZMA:
+		case XARCHIVETYPE_TAR_XZ:
 		case XARCHIVETYPE_TAR_LZOP:
 		case XARCHIVETYPE_TAR:
 		case XARCHIVETYPE_ZIP: