Don't bother creating Archive.supported_formtsf or jsdoor

src/sbbs3/js_archive.c

@@ -708,7 +708,7 @@ JSObject* js_CreateArchiveClass(JSContext* cx, JSObject* parent, const str_list_
 	                             , NULL /* props, set in constructor */
 	                             , NULL /* funcs, set in constructor */
 	                             , NULL, NULL);
-	if (obj != NULL) {
+	if (obj != NULL && supported_formats != NULL) {
 		jsval val;
 		if (JS_GetProperty(cx, parent, js_archive_class.name, &val) && !JSVAL_NULL_OR_VOID(val)) {
 			JSObject* constructor;

src/sbbs3/jsdoor.c

@@ -273,7 +273,7 @@ bool DLLCALL js_CreateCommonObjects(JSContext* js_cx
 			break;
 
 		/* Archive Class */
-		if (js_CreateArchiveClass(js_cx, *glob) == NULL)
+		if (js_CreateArchiveClass(js_cx, *glob, NULL) == NULL)
 			break;
 
 		/* COM Class */