diff --git a/vcell-client/UserDocumentation/originalXML/topics/ch_1/Introduction/File.xml b/vcell-client/UserDocumentation/originalXML/topics/ch_1/Introduction/File.xml
index 76fb04ed43..a6283fd33e 100644
--- a/vcell-client/UserDocumentation/originalXML/topics/ch_1/Introduction/File.xml
+++ b/vcell-client/UserDocumentation/originalXML/topics/ch_1/Introduction/File.xml
@@ -7,7 +7,7 @@
 	</introduction>
 	
 	<appearance>
-		<imgReference target = "FileMenu.png"/>
+		<imgReference target = "FileMenu.PNG"/>
 	</appearance>
 	
 	<operations> 
diff --git a/vcell-client/UserDocumentation/originalXML/topics/ch_1/Introduction/New.xml b/vcell-client/UserDocumentation/originalXML/topics/ch_1/Introduction/New.xml
index 33d583b4ba..2bd5fcb6a0 100644
--- a/vcell-client/UserDocumentation/originalXML/topics/ch_1/Introduction/New.xml
+++ b/vcell-client/UserDocumentation/originalXML/topics/ch_1/Introduction/New.xml
@@ -8,7 +8,7 @@
 	</introduction>
 	
 	<appearance>
-		<imgReference target = "FileNewMathModelMenuItem.png"/>
+		<imgReference target = "FileNewMathModelMenuItem.PNG"/>
 	</appearance>
 	
 	<operations>
@@ -36,7 +36,7 @@
 			VCell database; or created from scratch.
 		For further information on creating geometries, refer to the section on <link target = "GeometryOverview">Geometry</link>.
 		</para>
-		<imgReference target = "FileNewMathModelNewGeom.png"/>
+		<imgReference target = "FileNewMathModelNewGeom.PNG"/>
 		</item>
 		<item>
 		<para>
@@ -46,7 +46,7 @@
 			in the BioModel that should be converted to a MathModel.
 		<bold>Note:</bold> Each application has a separate MathModel associated with it.  
 		</para>
-		<imgReference target = "FileNewMathFromBio.png"/>
+		<imgReference target = "FileNewMathFromBio.PNG"/>
 		<imgReference target = "FileNewMathFromBioAppln.PNG"/>
 		</item>
 	</list>
diff --git a/vcell-client/UserDocumentation/originalXML/topics/ch_1/Introduction/Open.xml b/vcell-client/UserDocumentation/originalXML/topics/ch_1/Introduction/Open.xml
index 8111e50691..b453cdfd23 100644
--- a/vcell-client/UserDocumentation/originalXML/topics/ch_1/Introduction/Open.xml
+++ b/vcell-client/UserDocumentation/originalXML/topics/ch_1/Introduction/Open.xml
@@ -17,7 +17,7 @@
 	For example, clicking on 'File->Open->BioModel' will open a dialog that lists all BioModels accessible to current user.
 	Additionally, <bold>Local...</bold> displays a local file chooser to select VCell documents saved on the user's own computer (using 'File->Export...' or 'File->Save As Local...').
 	</para>
-	<imgReference target = "FileNewMathFromBio.png"/>
+	<imgReference target = "FileNewMathFromBio.PNG"/>
 	</operations>
 	<comments>  </comments>