diff --git a/apps/hdt-wine-overlay/WineOverlayPlugin.cs b/apps/hdt-wine-overlay/WineOverlayPlugin.cs
index f7b3cb9..f3009e1 100644
--- a/apps/hdt-wine-overlay/WineOverlayPlugin.cs
+++ b/apps/hdt-wine-overlay/WineOverlayPlugin.cs
@@ -100,6 +100,19 @@ namespace HdtWineOverlay
 
 			Log.Info("Applied Wine overlay workarounds");
 
+			// HDT has died mid-game with nothing in its log, and under Wine its
+			// stderr goes nowhere. Note starts, clean exits and unhandled .NET
+			// exceptions in a file written synchronously: a start without an
+			// exit line means the process was killed or crashed natively (see
+			// C:\users\steamuser\wine-crashes.txt for winedbg's side).
+			if(!_crashCaptureRegistered)
+			{
+				_crashCaptureRegistered = true;
+				AppDomain.CurrentDomain.UnhandledException += (s, e) => CrashCapture($"unhandled exception (terminating={e.IsTerminating}): {e.ExceptionObject}");
+				AppDomain.CurrentDomain.ProcessExit += (s, e) => CrashCapture("clean exit");
+				CrashCapture("started");
+			}
+
 			if(System.IO.File.Exists(System.IO.Path.Combine(Config.AppDataPath, "wine-overlay-test")))
 				ShowTestPopup();
 		}
@@ -169,6 +182,21 @@ namespace HdtWineOverlay
 			}
 		}
 
+		private static bool _crashCaptureRegistered;
+
+		private static void CrashCapture(string what)
+		{
+			try
+			{
+				System.IO.File.AppendAllText(System.IO.Path.Combine(Config.AppDataPath, "crash-capture.txt"),
+					$"{DateTime.Now:yyyy-MM-dd HH:mm:ss.fff} pid {System.Diagnostics.Process.GetCurrentProcess().Id}: {what}\r\n");
+			}
+			catch
+			{
+				// Nothing sensible to do while the process is going down.
+			}
+		}
+
 		private void OnToolTipOpened(object sender, RoutedEventArgs e)
 		{
 			if(_active && PresentationSource.FromVisual((Visual)sender) is HwndSource source)