From bd37e3f84d86f07df0840fc8f066ed9a4d198fbe Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 13 Jan 2026 16:38:27 +0000
Subject: [PATCH 1/3] Initial plan


From 88efbee978e4ba3f82357101f69a19db456f307d Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 13 Jan 2026 16:43:46 +0000
Subject: [PATCH 2/3] Fix relative path handling in command line arguments

Co-authored-by: emako <24737061+emako@users.noreply.github.com>
---
 QuickLook/App.xaml.cs | 39 ++++++++++++++++++++++++++++++---------
 1 file changed, 30 insertions(+), 9 deletions(-)

diff --git a/QuickLook/App.xaml.cs b/QuickLook/App.xaml.cs
index 890243402..75570cd1c 100644
--- a/QuickLook/App.xaml.cs
+++ b/QuickLook/App.xaml.cs
@@ -126,8 +126,19 @@ protected override void OnStartup(StartupEventArgs e)
         RunListener(e);
 
         // First instance: run and preview this file
-        if (e.Args.Any() && (Directory.Exists(e.Args.First()) || File.Exists(e.Args.First())))
-            PipeServerManager.SendMessage(PipeMessages.Toggle, e.Args.First());
+        if (e.Args.Any())
+        {
+            try
+            {
+                var path = Path.GetFullPath(e.Args.First());
+                if (Directory.Exists(path) || File.Exists(path))
+                    PipeServerManager.SendMessage(PipeMessages.Toggle, path);
+            }
+            catch
+            {
+                // Invalid path, ignore
+            }
+        }
 
         // Exception handling events which are not caught in the Task thread
         TaskScheduler.UnobservedTaskException += (_, e) =>
@@ -290,16 +301,26 @@ private bool EnsureFirstInstance(string[] args)
             return true;
 
         // Second instance: preview this file
-        if (args.Any() && (Directory.Exists(args.First()) || File.Exists(args.First())))
+        if (args.Any())
         {
-            PipeServerManager.SendMessage(PipeMessages.Toggle, args.First(), [.. args.Skip(1)]);
+            try
+            {
+                var path = Path.GetFullPath(args.First());
+                if (Directory.Exists(path) || File.Exists(path))
+                {
+                    PipeServerManager.SendMessage(PipeMessages.Toggle, path, [.. args.Skip(1)]);
+                    return false;
+                }
+            }
+            catch
+            {
+                // Invalid path, continue to show duplicate message
+            }
         }
+        
         // Second instance: duplicate
-        else
-        {
-            MessageBox.Show(TranslationHelper.Get("APP_SECOND_TEXT"), TranslationHelper.Get("APP_SECOND"),
-                MessageBoxButton.OK, MessageBoxImage.Information);
-        }
+        MessageBox.Show(TranslationHelper.Get("APP_SECOND_TEXT"), TranslationHelper.Get("APP_SECOND"),
+            MessageBoxButton.OK, MessageBoxImage.Information);
 
         return false;
     }

From b3ee2cf020d7fa07e4fd7bbc4cea2982e3fe675a Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 13 Jan 2026 16:46:21 +0000
Subject: [PATCH 3/3] Specify exception types in catch blocks for better error
 handling

Co-authored-by: emako <24737061+emako@users.noreply.github.com>
---
 QuickLook/App.xaml.cs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/QuickLook/App.xaml.cs b/QuickLook/App.xaml.cs
index 75570cd1c..42cf48b38 100644
--- a/QuickLook/App.xaml.cs
+++ b/QuickLook/App.xaml.cs
@@ -25,6 +25,7 @@
 using System.IO;
 using System.Linq;
 using System.Reflection;
+using System.Security;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Windows;
@@ -134,7 +135,8 @@ protected override void OnStartup(StartupEventArgs e)
                 if (Directory.Exists(path) || File.Exists(path))
                     PipeServerManager.SendMessage(PipeMessages.Toggle, path);
             }
-            catch
+            catch (Exception ex) when (ex is ArgumentException || ex is SecurityException || 
+                                       ex is NotSupportedException || ex is PathTooLongException)
             {
                 // Invalid path, ignore
             }
@@ -312,7 +314,8 @@ private bool EnsureFirstInstance(string[] args)
                     return false;
                 }
             }
-            catch
+            catch (Exception ex) when (ex is ArgumentException || ex is SecurityException || 
+                                       ex is NotSupportedException || ex is PathTooLongException)
             {
                 // Invalid path, continue to show duplicate message
             }