diff --git a/PESubsystem/.vs/PESubsystem/v15/.suo b/PESubsystem/.vs/PESubsystem/v15/.suo
new file mode 100644
index 0000000..1ace1b5
Binary files /dev/null and b/PESubsystem/.vs/PESubsystem/v15/.suo differ
diff --git a/PESubsystem/PESubsystem.sln b/PESubsystem/PESubsystem.sln
new file mode 100644
index 0000000..2237608
--- /dev/null
+++ b/PESubsystem/PESubsystem.sln
@@ -0,0 +1,22 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.26228.76
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PESubsystem", "PESubsystem\PESubsystem.csproj", "{3629B7C7-6FA1-4156-A996-2D0C98498C7B}"
+EndProject
+Global
+ GlobalSection(SolutionConfigurationPlatforms) = preSolution
+ Debug|Any CPU = Debug|Any CPU
+ Release|Any CPU = Release|Any CPU
+ EndGlobalSection
+ GlobalSection(ProjectConfigurationPlatforms) = postSolution
+ {3629B7C7-6FA1-4156-A996-2D0C98498C7B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+ {3629B7C7-6FA1-4156-A996-2D0C98498C7B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+ {3629B7C7-6FA1-4156-A996-2D0C98498C7B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+ {3629B7C7-6FA1-4156-A996-2D0C98498C7B}.Release|Any CPU.Build.0 = Release|Any CPU
+ EndGlobalSection
+ GlobalSection(SolutionProperties) = preSolution
+ HideSolutionNode = FALSE
+ EndGlobalSection
+EndGlobal
diff --git a/PESubsystem/PESubsystem/App.config b/PESubsystem/PESubsystem/App.config
new file mode 100644
index 0000000..88fa402
--- /dev/null
+++ b/PESubsystem/PESubsystem/App.config
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/PESubsystem/PESubsystem/PESubsystem.csproj b/PESubsystem/PESubsystem/PESubsystem.csproj
new file mode 100644
index 0000000..ab22640
--- /dev/null
+++ b/PESubsystem/PESubsystem/PESubsystem.csproj
@@ -0,0 +1,52 @@
+
+
+
+
+ Debug
+ AnyCPU
+ {3629B7C7-6FA1-4156-A996-2D0C98498C7B}
+ Exe
+ PESubsystem
+ PESubsystem
+ v4.5.2
+ 512
+ true
+
+
+ AnyCPU
+ true
+ full
+ false
+ bin\Debug\
+ DEBUG;TRACE
+ prompt
+ 4
+
+
+ AnyCPU
+ pdbonly
+ true
+ bin\Release\
+ TRACE
+ prompt
+ 4
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/PESubsystem/PESubsystem/Program.cs b/PESubsystem/PESubsystem/Program.cs
new file mode 100644
index 0000000..d61ab5a
--- /dev/null
+++ b/PESubsystem/PESubsystem/Program.cs
@@ -0,0 +1,94 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PESubsystem
+{
+ class Program
+ {
+
+ static short ReadInt16(Stream str)
+ {
+ byte[] IntBytes = new byte[2];
+ str.Read(IntBytes, 0x00, 0x2);
+ return BitConverter.ToInt16(IntBytes, 0x0);
+ }
+
+ static void WriteInt16(Stream str, short shr)
+ {
+ byte[] IntBytes = BitConverter.GetBytes(shr);
+ str.Write(IntBytes, 0x00, 0x2);
+ }
+ static int ReadInt32(Stream str)
+ {
+ byte[] IntBytes = new byte[4];
+ str.Read(IntBytes, 0x00, 0x4);
+ return BitConverter.ToInt32(IntBytes,0x0);
+ }
+ static void Main(string[] args)
+ {
+ string FileName = "";
+ if(args.Length >= 1)
+ {
+ FileName = args[0];
+ }
+ else
+ {
+ Console.Write("Enter Filepath: ");
+ FileName = Console.ReadLine();
+ }
+
+ FileStream fs = new FileStream(FileName, FileMode.Open, FileAccess.ReadWrite);
+
+ fs.Seek(0x3C, SeekOrigin.Begin);
+ int PELocation = ReadInt32(fs);
+
+ Console.WriteLine("PE Header Location: " + PELocation.ToString());
+
+ fs.Seek(PELocation, SeekOrigin.Begin);
+ fs.Seek(0x5C, SeekOrigin.Current);
+
+ int Subsystem = ReadInt16(fs);
+
+ string Subsystem_Str = "";
+
+ switch(Subsystem)
+ {
+ case 1:
+ Subsystem_Str = "Win32_DRIVER";
+ break;
+ case 2:
+ Subsystem_Str = "Win32_GUI";
+ break;
+ case 3:
+ Subsystem_Str = "Win32_CUI";
+ break;
+ default:
+ Subsystem_Str = "UNKNOWN";
+ break;
+ }
+
+ Console.WriteLine("PE Subsystem: " + Subsystem.ToString() + " ("+ Subsystem_Str+")");
+
+ short NewSubsys = 0;
+
+ if (args.Length >= 2)
+ {
+ NewSubsys = Int16.Parse(args[1]);
+ }
+ else
+ {
+ Console.WriteLine("\nSubsystems:\n1) WIN32_DRIVER\n2) WIN32_GUI\n3) WIN32_CUI\n\nEnter new subsystem value: ");
+ NewSubsys = Int16.Parse(Console.ReadLine());
+ }
+
+ fs.Seek(-2, SeekOrigin.Current);
+ WriteInt16(fs, NewSubsys);
+
+ Console.WriteLine("Done! Subsystem value changed to: " + NewSubsys + "\nBlessed Be!");
+ }
+ }
+}
diff --git a/PESubsystem/PESubsystem/Properties/AssemblyInfo.cs b/PESubsystem/PESubsystem/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..9725bb0
--- /dev/null
+++ b/PESubsystem/PESubsystem/Properties/AssemblyInfo.cs
@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("PESubsystem")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("PESubsystem")]
+[assembly: AssemblyCopyright("Copyright © 2019")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components. If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("3629b7c7-6fa1-4156-a996-2d0c98498c7b")]
+
+// Version information for an assembly consists of the following four values:
+//
+// Major Version
+// Minor Version
+// Build Number
+// Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]