Index: lams_common/src/java/org/lamsfoundation/lams/learningdesign/service/ExportToolContentService.java
===================================================================
diff -u -r2a60aefd13ef4aac8e67f7e23ff837062aa837d9 -rc9baa723b637ceafa98d9f1b9ad8e98bed53cff5
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/service/ExportToolContentService.java	(.../ExportToolContentService.java)	(revision 2a60aefd13ef4aac8e67f7e23ff837062aa837d9)
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/service/ExportToolContentService.java	(.../ExportToolContentService.java)	(revision c9baa723b637ceafa98d9f1b9ad8e98bed53cff5)
@@ -519,7 +519,8 @@
 	    }
 
 	    // zip file name with full path
-	    targetZipFileName = ldDto.getTitle() + ExportToolContentService.EXPORT_TOOLCONTNET_ZIP_SUFFIX;
+	    targetZipFileName = FileUtil.stripInvalidChars(ldDto.getTitle())
+		    + ExportToolContentService.EXPORT_TOOLCONTNET_ZIP_SUFFIX;
 
 	    log.debug("Create export content target zip file. File name is " + targetZipFileName);
 	    // create zip file and return zip full file name
@@ -1271,7 +1272,7 @@
 	    if (removedActMap.containsKey(actDto.getActivityID())) {
 		continue;
 	    }
-	    
+
 	    Activity act = getActivity(actDto, groupingMapper, toolMapper, defaultActivityToParentActivityMapping);
 	    // so far, the activitiy ID is still old one, so setup the
 	    // mapping relation between old ID and new activity.