diff --git a/Dalamud/SafeMemory.cs b/Dalamud/SafeMemory.cs
index a8ac40a5d..9a1af0625 100644
--- a/Dalamud/SafeMemory.cs
+++ b/Dalamud/SafeMemory.cs
@@ -1,6 +1,8 @@
 using System.Runtime.InteropServices;
 using System.Text;
 
+using Windows.Win32.Foundation;
+
 namespace Dalamud;
 
 /// <summary>
@@ -28,12 +30,18 @@ public static class SafeMemory
     /// <returns>Whether the read succeeded.</returns>
     public static unsafe bool ReadBytes(IntPtr address, int count, out byte[] buffer)
     {
+        if (Handle.IsClosed || Handle.IsInvalid)
+        {
+            buffer = [];
+            return false;
+        }
+
         buffer = new byte[count <= 0 ? 0 : count];
         fixed (byte* p = buffer)
         {
             UIntPtr bytesRead;
             if (!Windows.Win32.PInvoke.ReadProcessMemory(
-                Handle,
+                (HANDLE)Handle.DangerousGetHandle(),
                 address.ToPointer(),
                 p,
                 new UIntPtr((uint)count),
@@ -54,6 +62,9 @@ public static class SafeMemory
     /// <returns>Whether the write succeeded.</returns>
     public static unsafe bool WriteBytes(IntPtr address, byte[] buffer)
     {
+        if (Handle.IsClosed || Handle.IsInvalid)
+            return false;
+
         if (buffer.Length == 0)
             return true;
 
@@ -61,7 +72,7 @@ public static class SafeMemory
         fixed (byte* p = buffer)
         {
             if (!Windows.Win32.PInvoke.WriteProcessMemory(
-                Handle,
+                (HANDLE)Handle.DangerousGetHandle(),
                 address.ToPointer(),
                 p,
                 new UIntPtr((uint)buffer.Length),
diff --git a/Dalamud/Utility/FilesystemUtil.cs b/Dalamud/Utility/FilesystemUtil.cs
index 3b4298b37..560e06da3 100644
--- a/Dalamud/Utility/FilesystemUtil.cs
+++ b/Dalamud/Utility/FilesystemUtil.cs
@@ -1,7 +1,8 @@
-using System.ComponentModel;
+using System.ComponentModel;
 using System.IO;
 using System.Text;
 
+using Windows.Win32.Foundation;
 using Windows.Win32.Storage.FileSystem;
 
 namespace Dalamud.Utility;
@@ -61,8 +62,11 @@ public static class FilesystemUtil
 
         // Write the data
         uint bytesWritten = 0;
-        if (!Windows.Win32.PInvoke.WriteFile(tempFile, new ReadOnlySpan<byte>(bytes), &bytesWritten, null))
-            throw new Win32Exception();
+        fixed (byte* ptr = bytes)
+        {
+            if (!Windows.Win32.PInvoke.WriteFile((HANDLE)tempFile.DangerousGetHandle(), ptr, (uint)bytes.Length, &bytesWritten, null))
+                throw new Win32Exception();
+        }
 
         if (bytesWritten != bytes.Length)
             throw new Exception($"Could not write all bytes to temp file ({bytesWritten} of {bytes.Length})");
diff --git a/Directory.Packages.props b/Directory.Packages.props
index 6c5070d35..58e355400 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -27,7 +27,7 @@
 
     <!-- DirectX / Win32 -->
     <PackageVersion Include="TerraFX.Interop.Windows" Version="10.0.26100.5" />
-    <PackageVersion Include="Microsoft.Windows.CsWin32" Version="0.3.183" />
+    <PackageVersion Include="Microsoft.Windows.CsWin32" Version="0.3.259" />
 
     <!-- Logging -->
     <PackageVersion Include="Serilog" Version="4.0.2" />