Index: lams_central/web/includes/javascript/upload.js
===================================================================
diff -u -re6583c4c5d7e77ce169fec274887e0ef2d107958 -r97b5a8b1fae1060952251c433b466f27af6d9b2e
--- lams_central/web/includes/javascript/upload.js	(.../upload.js)	(revision e6583c4c5d7e77ce169fec274887e0ef2d107958)
+++ lams_central/web/includes/javascript/upload.js	(.../upload.js)	(revision 97b5a8b1fae1060952251c433b466f27af6d9b2e)
@@ -43,6 +43,21 @@
     return true;
 }
 
+//returns false if not simple .xls file.
+function validateShowErrorSpreadsheetType(file, errorMessage, showFilename, errDivId) {
+    // Check the file type.
+	clearFileError(errDivId);
+	var filename = file.name;
+	var isExcel = false;
+	if ( filename ) {
+		var extname = filename.substr((~-filename.lastIndexOf(".") >>> 0) + 2);
+		isExcel = extname.length > 0 && extname.toUpperCase() === "XLS" ;
+	} 
+	if ( ! isExcel ) {
+		showFileError(showFilename ? file.value + ": " + errorMessage: errorMessage, errDivId);
+	}
+	return isExcel;
+}
 // file: the file to check
 // maxSize: maximum size allowed in bytes
 // rawErrorMessage: message text from I18N files. Must contain '{0}' which will be replaced by the size and the units