diff --git a/Common/OfficeFileFormatChecker2.cpp b/Common/OfficeFileFormatChecker2.cpp
index 0f4e9ff4ec..a5d4366c9c 100644
--- a/Common/OfficeFileFormatChecker2.cpp
+++ b/Common/OfficeFileFormatChecker2.cpp
@@ -559,6 +559,8 @@ bool COfficeFileFormatChecker::isOfficeFile(const std::wstring & _fileName)
 		nFileType = AVS_OFFICESTUDIO_FILE_CANVAS_PDF;
     else if (0 == sExt.compare(L".doct"))//случай архива с html viewer
 		nFileType = AVS_OFFICESTUDIO_FILE_TEAMLAB_DOCY;
+	else if (0 == sExt.compare(L".xlsb"))
+		nFileType = AVS_OFFICESTUDIO_FILE_SPREADSHEET_XLSB;
     else //if (0 == sExt.compare(L".txt") || 0 == sExt.compare(L".xml")) //volsciv.rtf -или любой другой
         nFileType = AVS_OFFICESTUDIO_FILE_DOCUMENT_TXT;