Index: lams_tool_larsrc/src/java/org/lamsfoundation/lams/tool/rsrc/web/servlet/ExportServlet.java
===================================================================
diff -u -rf8ab6c53122ad8a79807dbbb92c8ea9da96ad3eb -rd8a763186a3bf55404b11c4f18df68153b9b84c8
--- lams_tool_larsrc/src/java/org/lamsfoundation/lams/tool/rsrc/web/servlet/ExportServlet.java	(.../ExportServlet.java)	(revision f8ab6c53122ad8a79807dbbb92c8ea9da96ad3eb)
+++ lams_tool_larsrc/src/java/org/lamsfoundation/lams/tool/rsrc/web/servlet/ExportServlet.java	(.../ExportServlet.java)	(revision d8a763186a3bf55404b11c4f18df68153b9b84c8)
@@ -181,7 +181,7 @@
 					}
 					idx++;
 				}
-				summary.setAttachmentLocalUrl(userName + "/" + idx + "/" + summary.getFileName());
+				summary.setAttachmentLocalUrl(userName + "/" + idx + "/" + summary.getFileUuid() + '.' + FileUtil.getFileExtension(summary.getFileName()));
 				handler.saveFile(summary.getFileUuid(), FileUtil.getFullPath(directoryName, summary.getAttachmentLocalUrl()));
 			} catch (Exception e) {
 				logger.error("Export forum topic attachment failed: " + e.toString());