diff --git a/mdop/appv-v5/creating-and-managing-app-v-51-virtualized-applications.md b/mdop/appv-v5/creating-and-managing-app-v-51-virtualized-applications.md
index b2c424e671..207b221552 100644
--- a/mdop/appv-v5/creating-and-managing-app-v-51-virtualized-applications.md
+++ b/mdop/appv-v5/creating-and-managing-app-v-51-virtualized-applications.md
@@ -18,6 +18,9 @@ After you have properly deployed the Microsoft Application Virtualization (App-V
 **Note**  
 For more information about configuring the App-V 5.1 sequencer, sequencing best practices, and an example of creating and updating a virtual application, see the [Microsoft Application Virtualization 5.0 Sequencing Guide](http://download.microsoft.com/download/F/7/8/F784A197-73BE-48FF-83DA-4102C05A6D44/App-V 5.0 Sequencing Guide.docx).
 
+**Note**  
+The App-V 5.x Sequencer cannot sequence applications with filenames matching "CO_<x>" where x is any numeral. Error 0x8007139F will be generated.
+
 ## Sequencing an application
 
 
diff --git a/mdop/appv-v5/how-to-sequence-a-new-application-with-app-v-51-beta-gb18030.md b/mdop/appv-v5/how-to-sequence-a-new-application-with-app-v-51-beta-gb18030.md
index 35331cebf0..43bb3d046b 100644
--- a/mdop/appv-v5/how-to-sequence-a-new-application-with-app-v-51-beta-gb18030.md
+++ b/mdop/appv-v5/how-to-sequence-a-new-application-with-app-v-51-beta-gb18030.md
@@ -56,6 +56,9 @@ ms.prod: w10
 
     -   If short paths have been disabled for the virtualized package’s target volume, you must also sequence the package to a volume that was created and still has short-paths disabled. It cannot be the system volume.
 
+**Note**  
+The App-V 5.x Sequencer cannot sequence applications with filenames matching "CO_<x>" where x is any numeral. Error 0x8007139F will be generated.
+
 **To sequence a new standard application**
 
 1.  On the computer that runs the sequencer, click **All Programs**, and then Click **Microsoft Application Virtualization**, and then click **Microsoft Application Virtualization Sequencer**.
diff --git a/mdop/appv-v5/release-notes-for-app-v-51.md b/mdop/appv-v5/release-notes-for-app-v-51.md
index 9617650992..333b6f7931 100644
--- a/mdop/appv-v5/release-notes-for-app-v-51.md
+++ b/mdop/appv-v5/release-notes-for-app-v-51.md
@@ -136,6 +136,13 @@ App-V 5.1 does not support Visual Studio 2012.
 
 **Workaround**: None
 
+## Application filename restrictions for App-V 5.x Sequencer
+
+
+The App-V 5.x Sequencer cannot sequence applications with filenames matching "CO_<x>" where x is any numeral. Error 0x8007139F will be generated.
+
+**Workaround**: Use a different filename
+
 ## Got a suggestion for App-V?