Index: portal-impl/src/com/liferay/portal/upgrade/v6_0_12_to_6_1_0/UpgradeDocumentLibrary.java
===================================================================
--- portal-impl/src/com/liferay/portal/upgrade/v6_0_12_to_6_1_0/UpgradeDocumentLibrary.java	(revision 102319)
+++ portal-impl/src/com/liferay/portal/upgrade/v6_0_12_to_6_1_0/UpgradeDocumentLibrary.java	(working copy)
@@ -214,6 +214,7 @@
 				dlFileVersion.setFileEntryId(fileEntryId);
 				dlFileVersion.setMimeType(mimeType);
 				dlFileVersion.setVersion(version);
+				dlFileVersion.setExtension(extension);
 
 				if (_imageMimeTypes.contains(mimeType)) {
 					FileVersion fileVersion = new LiferayFileVersion(