Index: lams_tool_sbmt/web/learner/sbmtlearner.jsp
===================================================================
diff -u -r2b9d5a9ee7968957c73fa1311ec9274725d4cfe3 -rbc66c534c18e8e49ce8ed510418400cbc56fd605
--- lams_tool_sbmt/web/learner/sbmtlearner.jsp	(.../sbmtlearner.jsp)	(revision 2b9d5a9ee7968957c73fa1311ec9274725d4cfe3)
+++ lams_tool_sbmt/web/learner/sbmtlearner.jsp	(.../sbmtlearner.jsp)	(revision bc66c534c18e8e49ce8ed510418400cbc56fd605)
@@ -80,7 +80,7 @@
 				  onBeforeFileAdded: function(currentFile, files) {
 					  var name = currentFile.data.name || currentFile.name,
 					  	  extensionIndex = name.lastIndexOf('.'),
-					  	  valid = extensionIndex < 0 || !EXE_FILE_TYPES.includes(name.substring(extensionIndex).trim());
+					  	  valid = extensionIndex < 0 || !EXE_FILE_TYPES.includes(name.substring(extensionIndex).trim().toLowerCase());
 					  if (!valid) {
 						  uppy.info(EXE_FILE_ERROR, 'error', 10000);
 					  }