Index: lams_tool_task/web/pages/learning/learning.jsp
===================================================================
diff -u -re28fe624a0c9761166375a90de55c7869a77670e -rbc66c534c18e8e49ce8ed510418400cbc56fd605
--- lams_tool_task/web/pages/learning/learning.jsp	(.../learning.jsp)	(revision e28fe624a0c9761166375a90de55c7869a77670e)
+++ lams_tool_task/web/pages/learning/learning.jsp	(.../learning.jsp)	(revision bc66c534c18e8e49ce8ed510418400cbc56fd605)
@@ -178,7 +178,7 @@
 				  onBeforeFileAdded: function(currentFile, files) {
 					  var name = currentFile.data.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);
 					  }