diff --git a/modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj b/modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj
index 6d078ef18b0..3a3d1277f94 100644
--- a/modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj
+++ b/modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj
@@ -37,6 +37,7 @@
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.11.0" />
     <PackageReference Include="JetBrains.Rider.PathLocator" Version="1.0.12" />
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.VisualStudio.SolutionPersistence" Version="1.0.52" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <Reference Include="GodotSharp">
       <HintPath>$(GodotApiAssembliesDir)/GodotSharp.dll</HintPath>
diff --git a/modules/mono/editor/GodotTools/GodotTools/Internals/GodotSharpDirs.cs b/modules/mono/editor/GodotTools/GodotTools/Internals/GodotSharpDirs.cs
index 3b761577ae8..52d628fd014 100644
--- a/modules/mono/editor/GodotTools/GodotTools/Internals/GodotSharpDirs.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/Internals/GodotSharpDirs.cs
@@ -1,9 +1,12 @@
+using System;
+using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.IO;
+using System.Threading;
 using Godot;
 using Godot.NativeInterop;
-using GodotTools.Core;
-using static GodotTools.Internals.Globals;
+using Microsoft.VisualStudio.SolutionPersistence;
+using Microsoft.VisualStudio.SolutionPersistence.Serializer;
 
 namespace GodotTools.Internals
 {
@@ -73,17 +76,70 @@ namespace GodotTools.Internals
             string? slnParentDir = (string?)ProjectSettings.GetSetting("dotnet/project/solution_directory");
             if (string.IsNullOrEmpty(slnParentDir))
                 slnParentDir = "res://";
-            else if (!slnParentDir.StartsWith("res://", System.StringComparison.Ordinal))
+            else if (!slnParentDir.StartsWith("res://", StringComparison.Ordinal))
                 slnParentDir = "res://" + slnParentDir;
 
             // The csproj should be in the same folder as project.godot.
             string csprojParentDir = "res://";
 
-            _projectSlnPath = Path.Combine(ProjectSettings.GlobalizePath(slnParentDir),
-                string.Concat(_projectAssemblyName, ".sln"));
-
+            // Set csproj path first and use it to find the sln/slnx file with the assembly
             _projectCsProjPath = Path.Combine(ProjectSettings.GlobalizePath(csprojParentDir),
                 string.Concat(_projectAssemblyName, ".csproj"));
+
+            _projectSlnPath = FindSolutionFileWithAssemblyName(slnParentDir, _projectAssemblyName);
+        }
+
+        private static string FindSolutionFileWithAssemblyName(string directory, string assemblyName)
+        {
+            // Will convert ".." to load solutions from parent directory when appropriate
+            string slnAbsolutePath = Path.GetFullPath(ProjectSettings.GlobalizePath(directory));
+
+            List<string> solutionFilePaths = new();
+            solutionFilePaths.AddRange(Directory.GetFiles(slnAbsolutePath, "*.sln"));
+            solutionFilePaths.AddRange(Directory.GetFiles(slnAbsolutePath, "*.slnx"));
+
+            if (solutionFilePaths.Count == 0)
+                return Path.Combine(slnAbsolutePath, $"{assemblyName}.sln");
+
+            List<string> matchingSolutions = new();
+
+            foreach (string solutionFilePath in solutionFilePaths)
+            {
+                ISolutionSerializer? serializer = SolutionSerializers.GetSerializerByMoniker(solutionFilePath);
+                if (serializer is null)
+                    continue;
+
+                string? solutionDirectory = Path.GetDirectoryName(solutionFilePath);
+                if (solutionDirectory is null)
+                    continue;
+
+                var solution = serializer.OpenAsync(solutionFilePath, CancellationToken.None).Result;
+
+                foreach (var project in solution.SolutionProjects)
+                {
+                    // Convert '\' path separators on Windows to '/' to match Godot's Unix style separators
+                    var absoluteProjectFilePath = Path.GetFullPath(project.FilePath, solutionDirectory).Replace('\\', '/');
+
+                    if (string.Equals(absoluteProjectFilePath, _projectCsProjPath, StringComparison.Ordinal))
+                        matchingSolutions.Add(solutionFilePath);
+                }
+            }
+
+            switch (matchingSolutions.Count)
+            {
+                case 1:
+                    return matchingSolutions[0];
+
+                case > 1:
+                    GD.PushError(
+                        $"Multiple solutions containing a project with assembly name '{assemblyName}' were found:\n"
+                        + $"{string.Join('\n', matchingSolutions).Replace('\\', '/')}\n"
+                        + "Please ensure only one solution contains the project assembly.\n"
+                        + "If you have recently migrated to .slnx please ensure that you have removed the unused .sln.");
+                    break;
+            }
+
+            return Path.Combine(slnAbsolutePath, $"{assemblyName}.sln");
         }
 
         private static string? _projectAssemblyName;