diff --git a/src/shared/util/file-validation.ts b/src/shared/util/file-validation.ts
index 1b17a33e30..a5ae0e0418 100644
--- a/src/shared/util/file-validation.ts
+++ b/src/shared/util/file-validation.ts
@@ -34,6 +34,7 @@ const validExtensions = [
   '.mpp',
   '.msg',
   '.mso',
+  '.oa',
   '.odb',
   '.odf',
   '.odg',