diff --git a/Test/Applications/x2tTester/x2tTester.cpp b/Test/Applications/x2tTester/x2tTester.cpp
index 6a6a5ccdcc..ff66b59b1a 100644
--- a/Test/Applications/x2tTester/x2tTester.cpp
+++ b/Test/Applications/x2tTester/x2tTester.cpp
@@ -244,6 +244,7 @@ CFormatsList CFormatsList::GetOutputExts()
 	list.m_spreadsheets.push_back(L"csv");
 	list.m_spreadsheets.push_back(L"ods");
 	list.m_spreadsheets.push_back(L"ots");
+	list.m_spreadsheets.push_back(L"xlsb");
 	list.m_spreadsheets.push_back(L"xlsm");
 	list.m_spreadsheets.push_back(L"xlsx");
 	list.m_spreadsheets.push_back(L"xltm");