Add detail when failing to extract containers.

src/wix/WixToolset.Core.Burn/BurnBackendWarnings.cs

@@ -26,9 +26,9 @@ public static Message EmptyContainer(SourceLineNumber sourceLineNumbers, string
             return Message(sourceLineNumbers, Ids.EmptyContainer, "The Container '{0}' is being ignored because it doesn't have any payloads.", containerId);
         }
 
-        public static Message FailedToExtractAttachedContainers(SourceLineNumber sourceLineNumbers)
+        public static Message FailedToExtractAttachedContainers(SourceLineNumber sourceLineNumbers, string message)
         {
-            return Message(sourceLineNumbers, Ids.FailedToExtractAttachedContainers, "Failed to extract attached container. This most often happens when extracting a stripped bundle from the package cache, which is not supported.");
+            return Message(sourceLineNumbers, Ids.FailedToExtractAttachedContainers, "Failed to extract attached container. This most often happens when extracting a stripped bundle from the package cache, which is not supported. Detail: {0}", message);
         }
 
         public static Message HiddenBundleNotSupported(SourceLineNumber sourceLineNumbers, string packageId)

src/wix/WixToolset.Core.Burn/CommandLine/ExtractSubcommand.cs

@@ -72,9 +72,9 @@ public override Task<int> ExecuteAsync(CancellationToken cancellationToken)
                             reader.ExtractAttachedContainers(this.ExtractContainersPath, this.IntermediateFolder);
                         }
                     }
-                    catch
+                    catch (Exception e)
                     {
-                        this.Messaging.Write(BurnBackendWarnings.FailedToExtractAttachedContainers(new SourceLineNumber(this.ExtractContainersPath)));
+                        this.Messaging.Write(BurnBackendWarnings.FailedToExtractAttachedContainers(new SourceLineNumber(this.ExtractContainersPath), e.Message));
                     }
                 }
             }