Fix compiler warnings on linux for windows only functions

Stardrop/Utilities/NXMProtocol.cs

@@ -1,23 +1,30 @@
 using Microsoft.Win32;
 using System;
 using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
 
 namespace Stardrop.Utilities
 {
     internal static class NXMProtocol
     {
+        [SupportedOSPlatform("windows")]
         public static bool Register(string applicationPath)
         {
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows) is false)
+            {
+                Program.helper.Log($"Attempted to modify registery keys for NXM protocol on a non-Windows system!");
+                return false;
+            }
             try
             {
-                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows) is false)
+                using var software = Registry.CurrentUser.OpenSubKey("Software", writable: true);
+                using var classes = software?.OpenSubKey("Classes", writable: true);
+                if (classes is null)
                 {
-                    Program.helper.Log($"Attempted to modify registery keys for NXM protocol on a non-Windows system!");
                     return false;
                 }
-
-                var keyTest = Registry.CurrentUser.OpenSubKey("Software", true).OpenSubKey("Classes", true);
-                RegistryKey key = keyTest.CreateSubKey("nxm");
+
+                using RegistryKey key = classes.CreateSubKey("nxm");
                 key.SetValue("URL Protocol", "nxm");
                 key.CreateSubKey(@"shell\open\command").SetValue("", "\"" + applicationPath + "\" --nxm \"%1\"");
             }
@@ -29,35 +36,39 @@ public static bool Register(string applicationPath)
 
             return true;
         }
-
+        [SupportedOSPlatform("windows")]
         public static bool Validate(string applicationPath)
         {
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows) is false)
+            {
+                Program.helper.Log($"Attempted to modify registery keys for NXM protocol on a non-Windows system!");
+                return false;
+            }
             try
             {
-                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows) is false)
-                {
-                    Program.helper.Log($"Attempted to modify registery keys for NXM protocol on a non-Windows system!");
-                    return false;
-                }
 
-                var baseKeyTest = Registry.CurrentUser.OpenSubKey("Software", true).OpenSubKey("Classes", true).OpenSubKey("nxm", true);
-                if (baseKeyTest is null || baseKeyTest.GetValue("URL Protocol").ToString() != "nxm")
-                {
+                using var software = Registry.CurrentUser.OpenSubKey("Software", writable: true);
+                using var classes = software?.OpenSubKey("Classes", writable: true);
+                using var baseKey = classes?.OpenSubKey("nxm", writable: true);
+
+                if(baseKey is null)
                     return false;
-                }
-
-                var actualKeyTest = Registry.CurrentUser.OpenSubKey("Software", true).OpenSubKey("Classes", true).OpenSubKey(@"nxm\shell\open\command", true);
-                if (actualKeyTest.GetValue(String.Empty).ToString() != "\"" + applicationPath + "\" --nxm \"%1\"")
-                {
+
+                if (!string.Equals(baseKey.GetValue("URL Protocol")?.ToString(), "nxm", StringComparison.Ordinal))
                     return false;
-                }
+
+                using var commandKey = classes?.OpenSubKey(@"nxm\shell\open\command", writable: true);
+
+                return string.Equals(
+                    commandKey?.GetValue(string.Empty)?.ToString(),
+                    $"\"{applicationPath}\" --nxm \"%1\"",
+                    StringComparison.Ordinal);
+
             }
             catch (Exception ex)
             {
                 return false;
             }
-
-            return true;
         }
     }
 }

Stardrop/Views/SettingsWindow.axaml.cs

@@ -176,6 +176,15 @@ public SettingsWindow(double parentWindowHeight) : this()
 
         private async void RegisterNXMButton_Click(object? sender, RoutedEventArgs e)
         {
+            if (!OperatingSystem.IsWindows())
+            {
+                await new WarningWindow(
+                        Program.translation.Get("ui.warning.unsupported_platform"),
+                        Program.translation.Get("internal.ok"))
+                    .ShowDialog(this);
+                return;
+            }
+
             if (NXMProtocol.Validate(Program.executablePath) is false)
             {
                 var requestWindow = new MessageWindow(Program.translation.Get("ui.message.confirm_nxm_association"));

Stardrop/i18n/de.json

@@ -107,6 +107,7 @@
   "ui.warning.unable_to_read_log": "Die SMAPI-Logdatei konnte nicht gelesen werden, um die Spielversion zu ermitteln.\n\nMods werden nicht auf Updates geprüft.",
   "ui.warning.no_manifest": "Keine manifest.json in \"{0}\" gefunden.",
   "ui.warning.unable_to_load_mod": "Die Datei unter \"{0}\" konnte nicht geladen werden.\n\n Weitere Informationen findest du in der Logdatei.",
+  "ui.warning.unsupported_platform": "NXM Verknüpfung ist nur auf Windows supported",
 
   // Messages
   "ui.message.confirm_mod_deletion": "Bist du sicher, dass du {0} löschen möchtest? Dies kann nicht rückgängig gemacht werden.",

Stardrop/i18n/default.json

@@ -217,6 +217,7 @@
   "ui.warning.failed_to_get_download_link": "Failed to get the download url from Nexus Mods via the NXM link: {0}",
   "ui.warning.failed_to_set_association": "Failed to register the NXM protocol with Stardrop.\n\nSee log for details.",
   "ui.warning.already_associated": "Stardrop is already associated with the NXM protocol.",
+  "ui.warning.unsupported_platform": "NXM Connection is currently only supported on Windows",
 
   // Messages
   "ui.message.confirm_mod_deletion": "Are you sure you'd like to delete {0}? This cannot be undone.",