Index: source/filter/xcl97/XclImpChangeTrack.cxx
===================================================================
RCS file: /cvs/sc/sc/source/filter/xcl97/XclImpChangeTrack.cxx,v
retrieving revision 1.17
diff -u -r1.17 XclImpChangeTrack.cxx
--- source/filter/xcl97/XclImpChangeTrack.cxx	23 Apr 2003 17:31:52 -0000	1.17
+++ source/filter/xcl97/XclImpChangeTrack.cxx	16 Jul 2003 10:21:12 -0000
@@ -98,6 +98,7 @@
 //___________________________________________________________________
 
 extern const sal_Char* pRevLogStreamName;
+extern const sal_Char* pUserNamesStreamName;
 
 //___________________________________________________________________
 // class XclImpChangeTrack
@@ -117,6 +118,13 @@
 	SvStorage& rStorage = *pExcRoot->pRootStorage;
 
 	if( !rStorage.IsContained( sStreamName ) || !rStorage.IsStream( sStreamName ) )
+		return;
+
+	// Verify that the User Names stream exists before going any further. Excel adds both
+	// "Revision Log" and "User Names" streams when Change Tracking is active but the Revision log
+	// remains if Change Tracking is turned off.
+	String sUserNamesStreamName( pUserNamesStreamName, RTL_TEXTENCODING_ASCII_US );
+	if( !rStorage.IsContained( sUserNamesStreamName ) || !rStorage.IsStream( sUserNamesStreamName ) )
 		return;
 
 	pInStrm = rStorage.OpenStream( sStreamName, STREAM_STD_READ );