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I have a WPF application that's crashing once I get it onto machines that do not have a development environment installed-- if this is a dupe, I'm welcome to closing, but I my search-fu is failing to find an equivalent question. It appears that I'm getting a XamlParseException, but nothing more useful than that. I need to get useful information. Going through the Windows 7 event logs gives me this error log: Fault bucket , type 0 Event Name: CLR20r3 Response: Not available Cab Id: 0 Problem signature: P1: MyApp.exe P2: 1.0.0.0 P3: 4b88323d P4: PresentationFramework P5: 3.0.0.0 P6: 4a174fbc P7: 624f P8: e1 P9: System.Windows.Markup.XamlParse P10: Attached files: C:\Users\Mark\AppData\Local\Temp\WER7DC.tmp.WERInternalMetadata.xml These files may be available here: C:\Users\Mark\AppData\Local\Microsoft\Windows\WER\ReportArchive \AppCrash_generatortestbed_4fa7dff09a9e893eb675f488392571ced4ac8_04ef1100 Analysis symbol: Rechecking for solution: 0 Report Id: cd55060c-271f-11df-b6ff-001e52eefb8e Report Status: 1 I've checked those directories, and the first doesn't exist, while the second contains a wer file that just lists the loaded dlls. I could install a development environment on my test machine, but then it fails to be a test machine and I'm back to square one. I don't get this error with a dev environment installed, so I'm at a loss about how to get a verbose, useful error message. EDIT: building off of @Alastair Pitts' comment below, here's how I filled out the exception handling: private void App_DispatcherUnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e) { Exception theException = e.Exception; string theErrorPath = Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData) + "\\GeneratorTestbedError.txt"; using (System.IO.TextWriter theTextWriter = new System.IO.StreamWriter(theErrorPat

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