diff --git a/ui-admin/src/core-plugins/admin/1/as/services/xls-import/xls-import.py b/ui-admin/src/core-plugins/admin/1/as/services/xls-import/xls-import.py
index 631c5649d7a3c92253329e0daf22ab8e16e3df16..5df04a87afb291be80fd35dd690ef9a9b7f77a31 100644
--- a/ui-admin/src/core-plugins/admin/1/as/services/xls-import/xls-import.py
+++ b/ui-admin/src/core-plugins/admin/1/as/services/xls-import/xls-import.py
@@ -56,6 +56,9 @@ def process(context, parameters):
             tempPath = temp.getAbsolutePath()
             MasterDataRegistrationHelper.extractToDestination(zip_bytes, tempPath)
             byteArrays = MasterDataRegistrationHelper.getByteArrays(Path.of(tempPath), ".xls")
+            byteArrays.addAll(MasterDataRegistrationHelper.getByteArrays(Path.of(tempPath), ".xlsx"))
+            if len(byteArrays) == 0:
+                raise UserFailureException('No .xls or .xlsx fields found. These should be on the root folder of the zip file.')
             parameters.put('xls', byteArrays)
             allScripts = MasterDataRegistrationHelper.getAllScripts(Path.of(tempPath))
             parameters.put('scripts', allScripts)