diff --git a/src/VisualStudio/Core/Def/Implementation/Progression/GraphQueries/ContainsChildrenGraphQuery.cs b/src/VisualStudio/Core/Def/Implementation/Progression/GraphQueries/ContainsChildrenGraphQuery.cs
index ff6d7ce9a4ee132b2ca146c11afeefee7873ca25..02b5b060c39fa0f4174c98e91ed55d65faefde25 100644
--- a/src/VisualStudio/Core/Def/Implementation/Progression/GraphQueries/ContainsChildrenGraphQuery.cs
+++ b/src/VisualStudio/Core/Def/Implementation/Progression/GraphQueries/ContainsChildrenGraphQuery.cs
@@ -53,9 +53,11 @@ public async Task<GraphBuilder> GetGraphAsync(Solution solution, IGraphContext c
                                 // even when its extension fails to say so. One option would be to call DTEWrapper.IsRegisteredForLangService,
                                 // which may not be called here however since deadlock could happen.
 
-                                string ext = Path.GetExtension(uri.AbsolutePath);
-                                if (!string.IsNullOrEmpty(ext) &&
-                                    (ext.Equals(".cs", StringComparison.OrdinalIgnoreCase) || ext.Equals(".vb", StringComparison.OrdinalIgnoreCase)))
+                                // The Uri returned by `GetNestedValueByName()` above isn't necessarily absolute and the `OriginalString` is
+                                // the only property that doesn't throw if the UriKind is relative, so `OriginalString` must be used instead
+                                // of `AbsolutePath`.
+                                string ext = Path.GetExtension(uri.OriginalString);
+                                if (ext.Equals(".cs", StringComparison.OrdinalIgnoreCase) || ext.Equals(".vb", StringComparison.OrdinalIgnoreCase))
                                 {
                                     graphBuilder.AddDeferredPropertySet(node, DgmlNodeProperties.ContainsChildren, false);
                                 }
diff --git a/src/VisualStudio/Core/Test/Progression/ContainsChildrenGraphQueryTests.vb b/src/VisualStudio/Core/Test/Progression/ContainsChildrenGraphQueryTests.vb
index 6e38cac13eacef5744924af56c995d4d7d9e7457..0ead7a0cb51425c62d213be0073a8b04630bed57 100644
--- a/src/VisualStudio/Core/Test/Progression/ContainsChildrenGraphQueryTests.vb
+++ b/src/VisualStudio/Core/Test/Progression/ContainsChildrenGraphQueryTests.vb
@@ -1,13 +1,15 @@
 ' Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
 
+Imports System.Threading.Tasks
 Imports Microsoft.VisualStudio.GraphModel
+Imports Microsoft.VisualStudio.GraphModel.Schemas
 Imports Microsoft.VisualStudio.LanguageServices.Implementation.Progression
 Imports Roslyn.Test.Utilities
 
 Namespace Microsoft.VisualStudio.LanguageServices.UnitTests.Progression
     Public Class ContainsChildrenGraphQueryTests
         <Fact, Trait(Traits.Feature, Traits.Features.Progression)>
-        Public Async Function ContainsChildrenForDocument() As Threading.Tasks.Task
+        Public Async Function ContainsChildrenForDocument() As Task
             Using testState = Await ProgressionTestState.CreateAsync(
                     <Workspace>
                         <Project Language="C#" CommonReferences="true" FilePath="Z:\Project.csproj">
@@ -38,7 +40,7 @@ Namespace Microsoft.VisualStudio.LanguageServices.UnitTests.Progression
         End Function
 
         <Fact, Trait(Traits.Feature, Traits.Features.Progression)>
-        Public Async Function ContainsChildrenForEmptyDocument() As Threading.Tasks.Task
+        Public Async Function ContainsChildrenForEmptyDocument() As Task
             Using testState = Await ProgressionTestState.CreateAsync(
                     <Workspace>
                         <Project Language="C#" CommonReferences="true" FilePath="Z:\Project.csproj">
@@ -68,7 +70,7 @@ Namespace Microsoft.VisualStudio.LanguageServices.UnitTests.Progression
         <WorkItem(789685)>
         <WorkItem(794846)>
         <Fact, Trait(Traits.Feature, Traits.Features.Progression)>
-        Public Async Function ContainsChildrenForNotYetLoadedSolution() As Threading.Tasks.Task
+        Public Async Function ContainsChildrenForNotYetLoadedSolution() As Task
             Using testState = Await ProgressionTestState.CreateAsync(
                     <Workspace>
                         <Project Language="C#" CommonReferences="true" FilePath="Z:\Project.csproj">
@@ -104,5 +106,40 @@ Namespace Microsoft.VisualStudio.LanguageServices.UnitTests.Progression
 
             End Using
         End Function
+
+        <WorkItem(165369, "https://devdiv.visualstudio.com/DefaultCollection/DevDiv/_workitems#_a=edit&id=165369")>
+        <Fact, Trait(Traits.Feature, Traits.Features.Progression)>
+        Public Async Function ContainsChildrenForNodeWithRelativeUriPath() As Task
+            Using testState = Await ProgressionTestState.CreateAsync(
+                    <Workspace>
+                        <Project Language="Visual Basic" CommonReferences="true" FilePath="Z:\Project.vbproj">
+                            <Document FilePath="Z:\Project.vb">
+                                Class C
+                                End Class
+                            </Document>
+                        </Project>
+                    </Workspace>)
+
+                ' Force creation of a graph node that has a nested relative URI file path.  This simulates nodes that
+                ' other project types can give us for non-code files.  E.g., `favicon.ico` for web projects.
+                Dim nodeId = GraphNodeId.GetNested(GraphNodeId.GetPartial(CodeGraphNodeIdName.File, New Uri("/Z:/Project.vb", UriKind.Relative)))
+                Dim inputGraph = New Graph()
+                Dim node = inputGraph.Nodes.GetOrCreate(nodeId)
+                node.AddCategory(CodeNodeCategories.File)
+
+                Dim outputContext = Await testState.GetGraphContextAfterQuery(inputGraph, New ContainsChildrenGraphQuery(), GraphContextDirection.Any)
+                AssertSimplifiedGraphIs(
+                    outputContext.Graph,
+                    <DirectedGraph xmlns="http://schemas.microsoft.com/vs/2009/dgml">
+                        <Nodes>
+                            <Node Id="(@1)" Category="File" ContainsChildren="False"/>
+                        </Nodes>
+                        <Links/>
+                        <IdentifierAliases>
+                            <Alias n="1" Uri="File=/Z:/Project.vb"/>
+                        </IdentifierAliases>
+                    </DirectedGraph>)
+            End Using
+        End Function
     End Class
 End Namespace