diff --git a/oletools/common/clsid.py b/oletools/common/clsid.py
index 5c15035..4345520 100644
--- a/oletools/common/clsid.py
+++ b/oletools/common/clsid.py
@@ -42,14 +42,16 @@ http://www.decalage.info/python/oletools
 #                  SQ: - several additions by Shiao Qu
 # 2018-04-18       PL: - added known-bad CLSIDs from Cuckoo sandbox (issue #290)
 
-__version__ = '0.53dev5'
+__version__ = '0.53dev9'
 
 
 KNOWN_CLSIDS = {
     # MS Office files
-    'F4754C9B-64F5-4B40-8AF4-679732AC0607': 'Microsoft Word Document',
-    '00020906-0000-0000-C000-000000000046': 'Microsoft Word 97-2003 Document',
     '00020900-0000-0000-C000-000000000046': 'Microsoft Word 6.0-7.0 Document',
+    '00020906-0000-0000-C000-000000000046': 'Microsoft Word 97-2003 Document',
+    'F4754C9B-64F5-4B40-8AF4-679732AC0607': 'Microsoft Word Document',
+
+    '00020820-0000-0000-C000-000000000046': 'Microsoft Excel 97-2003 Worksheet',
     '00020832-0000-0000-C000-000000000046': 'Excel sheet with macro enabled',
     '00020833-0000-0000-C000-000000000046': 'Excel binary sheet with macro enabled',
 
diff --git a/setup.py b/setup.py
index c8e67f9..50c2f40 100644
--- a/setup.py
+++ b/setup.py
@@ -43,7 +43,7 @@ import os, fnmatch
 #--- METADATA -----------------------------------------------------------------
 
 name         = "oletools"
-version      = '0.53dev8'
+version      = '0.53dev9'
 desc         = "Python tools to analyze security characteristics of MS Office and OLE files (also called Structured Storage, Compound File Binary Format or Compound Document File Format), for Malware Analysis and Incident Response #DFIR"
 long_desc    = open('oletools/README.rst').read()
 author       = "Philippe Lagadec"