Changed the module spoofer to only change file name

TweaksLauncher.API/DevTools.cs

@@ -202,7 +202,7 @@ public bool TryBuild(string outputDir)
         {
             var buildConfig = Config.DefaultBuildConfig ?? "Debug";
 
-            if (!Dotnet(false, "build", CsprojPath, "-v", "q", "-c", buildConfig, "-o", outputDir))
+            if (!Dotnet(false, "build", CsprojPath, "-v", "q", "-c", buildConfig, $"-p:OutDir=\"{outputDir}\""))
             {
                 logger.Log($"Failed to build project at '{CsprojPath}'. Ignoring.", Color.Yellow);
                 return false;

TweaksLauncher.API/Imports.cs

@@ -0,0 +1,9 @@
+using System.Runtime.InteropServices;
+
+namespace TweaksLauncher;
+
+internal static unsafe partial class Imports
+{
+    [LibraryImport("ntdll")]
+    internal static partial void RtlCopyUnicodeString(Windows.Win32.Foundation.UNICODE_STRING* destination, Windows.Win32.Foundation.UNICODE_STRING* source);
+}

TweaksLauncher.API/Launcher.cs

@@ -1,7 +1,6 @@
 using MonoMod.RuntimeDetour;
 using System.Diagnostics.CodeAnalysis;
 using System.Drawing;
-using System.Runtime.InteropServices;
 
 namespace TweaksLauncher;
 
@@ -74,12 +73,6 @@ private static int StartGame(string[] args)
         logger.Log($"Game Exe: '{Context.GameExePath}'");
         logger.Log($"Unity Version: '{Context.UnityVersion}'");
 
-        if (!NativeLibrary.TryLoad(Context.GameExePath, out _))
-        {
-            logger.Log("Failed to load the original game exe module. Make sure you're running TweaksLauncher for the right architecture (x64 or x86).", Color.Red);
-            return -1;
-        }
-
         ProxyGenerator.Generate();
 
         DevTools.BuildProjectsForCurrentGame();

TweaksLauncher.API/ModuleSpoofer.cs

@@ -1,13 +1,15 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Runtime.InteropServices;
+using System.Text;
+using Windows.Win32.Foundation;
 
 namespace TweaksLauncher;
 
 internal unsafe static class ModuleSpoofer
 {
     [NotNull] private static Dobby.Patch<LdrGetDllFullNameSig>? ldrGetDllFullName = null;
 
-    private static nint fakeExeHandle;
+    private static UNICODE_STRING* fakeExeName;
     private static nint ourHandle;
     private static bool inited;
 
@@ -19,18 +21,36 @@ public static void Spoof(string fakeExePath)
         inited = true;
 
         ourHandle = NativeLibrary.GetMainProgramHandle();
-        fakeExeHandle = NativeLibrary.Load(fakeExePath);
+
+        fakeExePath = Path.GetFullPath(fakeExePath);
+        var length = (ushort)Encoding.Unicode.GetByteCount(fakeExePath);
+
+        fakeExeName = (UNICODE_STRING*)Marshal.AllocHGlobal(sizeof(UNICODE_STRING));
+        *fakeExeName = new()
+        {
+            Length = length,
+            MaximumLength = length,
+            Buffer = (char*)Marshal.StringToHGlobalUni(fakeExePath)
+        };
 
         ldrGetDllFullName = Dobby.CreatePatch<LdrGetDllFullNameSig>("ntdll", "LdrGetDllFullName", OnLdrGetDllFullName);
     }
 
-    private static nint OnLdrGetDllFullName(nint hModule, nint lpFilename)
+    private static uint OnLdrGetDllFullName(nint hModule, UNICODE_STRING* lpFilename)
     {
         if (hModule == 0 || hModule == ourHandle)
-            return ldrGetDllFullName.Original(fakeExeHandle, lpFilename);
+        {
+            Imports.RtlCopyUnicodeString(lpFilename, fakeExeName);
+
+
+            if (lpFilename->MaximumLength < fakeExeName->Length + sizeof(char))
+                return 0xC0000023; // STATUS_BUFFER_TOO_SMALL
+
+            return 0;
+        }
 
         return ldrGetDllFullName.Original(hModule, lpFilename);
     }
 
-    internal delegate nint LdrGetDllFullNameSig(nint hModule, nint lpFilename);
+    internal delegate uint LdrGetDllFullNameSig(nint hModule, UNICODE_STRING* lpFilename);
 }

TweaksLauncher.API/NativeMethods.txt

@@ -6,4 +6,5 @@ Module32Next
 Module32FirstW
 Module32NextW
 GetModuleHandle
-SetDllDirectory
+SetDllDirectory
+RtlCopyUnicodeString