diff --git a/Tests/Tests.cs b/Tests/Tests.cs
index 5a989db..2d534e6 100644
--- a/Tests/Tests.cs
+++ b/Tests/Tests.cs
@@ -669,6 +669,28 @@ 01 KERNELBASE!WaitForSingleObjectEx+147
             }
         }
 
+        [Fact]
+        [Trait("Category", "Unit")]
+        public void E2ESymSrvXMLFramesModuleFileExtensionMissing() {
+            using (var csr = new StackResolver()) {
+                var pdbPath = @"srv*https://msdl.microsoft.com/download/symbols";
+                var input = "Frame = <frame id=\"00\" pdb=\"ntdll.pdb\" age=\"1\" guid=\"C374E059-5793-9B92-6525-386A66A2D3F5\" module=\"ntdll\" rva=\"0x9F7E4\" />        \r\n" +
+"Frame = <frame id=\"01\" pdb=\"kernelbase.pdb\" age=\"1\" guid=\"E77E26E7-D1C4-72BB-2C05-DD17624A9E58\" module=\"KERNELBASE\" rva=\"0x38973\" />                          \n" +
+"Frame = <frame id=\"02\" pdb=\"SqlDK.pdb\" age=\"2\" guid=\"6a193443-3512-464b-8b8e-\r\n" +
+"d905ad930ee6\" module=\"sqldk\" rva=\"0x40609\" />                                    \r\n" +
+"<frame id=\"03\" pdb=\"vcruntime140.amd64.pdb\" age=\"1\" guid=\"AF138C3F-2933-4097-8883-C1071B13375E\" module=\"VCRUNTIME140\" rva=\"0xB8F0\" />\r\n" +
+"Frame = <frame id=\"04\" pdb=\"SqlDK.pdb\" age=\"2\" guid=\"6a193443-3512-464b-8b8e-d905ad930ee6\" module=\"sqldk\" rva=\"0x2249f\" />                                    \n";
+
+                var ret = csr.ResolveCallstacks(input, pdbPath, false, null, false, false, true, false, true, false, false, null);
+                var expected = @"00 ntdll!NtWaitForSingleObject+20
+01 KERNELBASE!WaitForSingleObjectEx+147
+02 sqldk!MemoryClerkInternal::AllocatePagesWithFailureMode+644
+03 VCRUNTIME140!__C_specific_handler+160	(d:\agent\_work\2\s\src\vctools\crt\vcruntime\src\eh\riscchandler.cpp:290)
+04 sqldk!Spinlock<244,2,1>::SpinToAcquireWithExponentialBackoff+349";
+                Assert.Equal(expected.Trim(), ret.Trim());
+            }
+        }
+
         /// End-to-end test with stacks being resolved based on symbols from symsrv, with a frame that needs "calculated base address" handling
         [Fact][Trait("Category", "Unit")]
         public void E2ESymSrvXMLFramesWithCalcBaseAddress() {