notepad++ attempt

CreamInstaller/Utility/Diagnostics.cs

@@ -1,10 +1,43 @@
-using System.Diagnostics;
+using System;
+using System.Diagnostics;
+using System.IO;
+
+using Microsoft.Win32;
 
 namespace CreamInstaller.Utility;
 
 internal static class Diagnostics
 {
-    internal static void OpenFileInNotepad(string path) => Process.Start(new ProcessStartInfo
+    private static string notepadPlusPlusPath;
+    internal static string NotepadPlusPlusPath
+    {
+        get
+        {
+            notepadPlusPlusPath ??= Registry.GetValue(@"HKEY_LOCAL_MACHINE\SOFTWARE\Notepad++", "", null) as string;
+            notepadPlusPlusPath ??= Registry.GetValue(@"HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432NODE\Notepad++", "", null) as string;
+            return notepadPlusPlusPath;
+        }
+    }
+
+    internal static string GetNotepadPath() => NotepadPlusPlusPath is not null ? NotepadPlusPlusPath + @"\notepad++.exe"
+        : Environment.GetFolderPath(Environment.SpecialFolder.Windows) + @"\notepad.exe";
+
+    internal static void OpenFileInNotepad(string path)
+    {
+        string npp = NotepadPlusPlusPath + @"\notepad++.exe";
+        if (Directory.Exists(NotepadPlusPlusPath) && File.Exists(npp))
+            OpenFileInNotepadPlusPlus(npp, path);
+        else
+            OpenFileInWindowsNotepad(path);
+    }
+
+    private static void OpenFileInNotepadPlusPlus(string npp, string path) => Process.Start(new ProcessStartInfo
+    {
+        FileName = npp,
+        Arguments = path
+    });
+
+    private static void OpenFileInWindowsNotepad(string path) => Process.Start(new ProcessStartInfo
     {
         FileName = "notepad.exe",
         Arguments = path

CreamInstaller/Utility/IconGrabber.cs

@@ -16,7 +16,7 @@ internal static class IconGrabber
 
     internal static Image GetFileIconImage(string path) => File.Exists(path) ? Icon.ExtractAssociatedIcon(path).ToBitmap() : null;
 
-    internal static Image GetNotepadImage() => GetFileIconImage(Environment.GetFolderPath(Environment.SpecialFolder.Windows) + @"\notepad.exe");
+    internal static Image GetNotepadImage() => GetFileIconImage(Diagnostics.GetNotepadPath());
 
     internal static Image GetCommandPromptImage() => GetFileIconImage(Environment.SystemDirectory + @"\cmd.exe");