Quick implementation

.gitignore

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+
+# Created by https://www.gitignore.io/api/dotnetcore,visualstudio
+# Edit at https://www.gitignore.io/?templates=dotnetcore,visualstudio
+
+### DotnetCore ###
+# .NET Core build folders
+/bin
+/obj
+
+# Common node modules locations
+/node_modules
+/wwwroot/node_modules
+
+
+### VisualStudio ###
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+##
+## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore
+
+# User-specific files
+*.rsuser
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Mono auto generated files
+mono_crash.*
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+
+# Visual Studio 2015/2017 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# Visual Studio 2017 auto generated files
+Generated\ Files/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUnit
+*.VisualState.xml
+TestResult.xml
+nunit-*.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# Benchmark Results
+BenchmarkDotNet.Artifacts/
+
+# .NET Core
+project.lock.json
+project.fragment.lock.json
+artifacts/
+
+# StyleCop
+StyleCopReport.xml
+
+# Files built by Visual Studio
+*_i.c
+*_p.c
+*_h.h
+*.ilk
+*.obj
+*.iobj
+*.pch
+*.pdb
+*.ipdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*_wpftmp.csproj
+*.log
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
+*.scc
+
+# Chutzpah Test files
+_Chutzpah*
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opendb
+*.opensdf
+*.sdf
+*.cachefile
+*.VC.db
+*.VC.VC.opendb
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+*.sap
+
+# Visual Studio Trace Files
+*.e2e
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# JustCode is a .NET coding add-in
+.JustCode
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# AxoCover is a Code Coverage Tool
+.axoCover/*
+!.axoCover/settings.json
+
+# Visual Studio code coverage results
+*.coverage
+*.coveragexml
+
+# NCrunch
+_NCrunch_*
+.*crunch*.local.xml
+nCrunchTemp_*
+
+# MightyMoose
+*.mm.*
+AutoTest.Net/
+
+# Web workbench (sass)
+.sass-cache/
+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.[Pp]ublish.xml
+*.azurePubxml
+# Note: Comment the next line if you want to checkin your web deploy settings,
+# but database connection strings (with potential passwords) will be unencrypted
+*.pubxml
+*.publishproj
+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+PublishScripts/
+
+# NuGet Packages
+*.nupkg
+# NuGet Symbol Packages
+*.snupkg
+# The packages folder can be ignored because of Package Restore
+**/[Pp]ackages/*
+# except build/, which is used as an MSBuild target.
+!**/[Pp]ackages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/[Pp]ackages/repositories.config
+# NuGet v3's project.json files produces more ignorable files
+*.nuget.props
+*.nuget.targets
+
+# Microsoft Azure Build Output
+csx/
+*.build.csdef
+
+# Microsoft Azure Emulator
+ecf/
+rcf/
+
+# Windows Store app package directories and files
+AppPackages/
+BundleArtifacts/
+Package.StoreAssociation.xml
+_pkginfo.txt
+*.appx
+*.appxbundle
+*.appxupload
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!?*.[Cc]ache/
+
+# Others
+ClientBin/
+~$*
+*~
+*.dbmdl
+*.dbproj.schemaview
+*.jfm
+*.pfx
+*.publishsettings
+orleans.codegen.cs
+
+# Including strong name files can present a security risk
+# (https://github.com/github/gitignore/pull/2483#issue-259490424)
+#*.snk
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+ServiceFabricBackup/
+*.rptproj.bak
+
+# SQL Server files
+*.mdf
+*.ldf
+*.ndf
+
+# Business Intelligence projects
+*.rdl.data
+*.bim.layout
+*.bim_*.settings
+*.rptproj.rsuser
+*- [Bb]ackup.rdl
+*- [Bb]ackup ([0-9]).rdl
+*- [Bb]ackup ([0-9][0-9]).rdl
+
+# Microsoft Fakes
+FakesAssemblies/
+
+# GhostDoc plugin setting file
+*.GhostDoc.xml
+
+# Node.js Tools for Visual Studio
+.ntvs_analysis.dat
+node_modules/
+
+# Visual Studio 6 build log
+*.plg
+
+# Visual Studio 6 workspace options file
+*.opt
+
+# Visual Studio 6 auto-generated workspace file (contains which files were open etc.)
+*.vbw
+
+# Visual Studio LightSwitch build output
+**/*.HTMLClient/GeneratedArtifacts
+**/*.DesktopClient/GeneratedArtifacts
+**/*.DesktopClient/ModelManifest.xml
+**/*.Server/GeneratedArtifacts
+**/*.Server/ModelManifest.xml
+_Pvt_Extensions
+
+# Paket dependency manager
+.paket/paket.exe
+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# CodeRush personal settings
+.cr/personal
+
+# Python Tools for Visual Studio (PTVS)
+__pycache__/
+*.pyc
+
+# Cake - Uncomment if you are using it
+# tools/**
+# !tools/packages.config
+
+# Tabs Studio
+*.tss
+
+# Telerik's JustMock configuration file
+*.jmconfig
+
+# BizTalk build output
+*.btp.cs
+*.btm.cs
+*.odx.cs
+*.xsd.cs
+
+# OpenCover UI analysis results
+OpenCover/
+
+# Azure Stream Analytics local run output
+ASALocalRun/
+
+# MSBuild Binary and Structured Log
+*.binlog
+
+# NVidia Nsight GPU debugger configuration file
+*.nvuser
+
+# MFractors (Xamarin productivity tool) working folder
+.mfractor/
+
+# Local History for Visual Studio
+.localhistory/
+
+# BeatPulse healthcheck temp database
+healthchecksdb
+
+# Backup folder for Package Reference Convert tool in Visual Studio 2017
+MigrationBackup/
+
+# End of https://www.gitignore.io/api/dotnetcore,visualstudio

SteamVRNoHeadsetModder.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29806.167
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SteamVRNoHeadsetModder", "SteamVRNoHeadsetModder\SteamVRNoHeadsetModder.csproj", "{CAC31805-064C-42B5-B759-34CE0029094F}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{CAC31805-064C-42B5-B759-34CE0029094F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{CAC31805-064C-42B5-B759-34CE0029094F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{CAC31805-064C-42B5-B759-34CE0029094F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{CAC31805-064C-42B5-B759-34CE0029094F}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {7885011D-9D5F-40F4-B2C8-E4F8624B9716}
+	EndGlobalSection
+EndGlobal

SteamVRNoHeadsetModder/Program.cs

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+using System;
+using System.IO;
+using Microsoft.Win32;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace SteamVRNoHeadsetModder
+{
+    class Program
+    {
+        private const string DRIVERS_DEFAULT_VRSETTINGS = "/steamapps/common/SteamVR/drivers/null/resources/settings/default.vrsettings";
+        private const string DEFAULT_VRSETTINGS = "/steamapps/common/SteamVR/resources/settings/default.vrsettings";
+
+        static void Main(string[] args)
+        {
+            string steamPath = (string)Registry.GetValue("HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Valve\\Steam", "InstallPath", "");
+            if(steamPath == "")
+            {
+                Console.WriteLine("Steam could not be found on this machine!");
+                return;
+            }
+            Console.WriteLine("Steam-Installation at {0}", steamPath);
+            Console.WriteLine("drivers default.vrsettings exists {0}", File.Exists(steamPath + DRIVERS_DEFAULT_VRSETTINGS));
+            Console.WriteLine("default.vrsettings exists {0}", File.Exists(steamPath + DEFAULT_VRSETTINGS));
+            Console.WriteLine("");
+            Console.WriteLine("------------------------------------------------");
+            Console.WriteLine("");
+
+            Console.WriteLine("Patch to:\n - [N]oHMD-Mode \n - [H]MD-Mode");
+            string input = Console.ReadLine().ToLower();
+
+            switch (input)
+            {
+                case "n":
+                    PatchToNoHmd(steamPath);
+                    break;
+                case "h":
+                    PatchToHmd(steamPath);
+                    break;
+                default:
+                    Console.WriteLine("Whuuut?");
+                    break;
+            }
+
+            Console.ReadLine();
+        }
+
+        private static void PatchToNoHmd(string steamPath)
+        {
+            Console.WriteLine("Patching drivers default.vrsettings...");
+            using (StreamReader reader = new StreamReader(steamPath + DRIVERS_DEFAULT_VRSETTINGS))
+            {
+                dynamic defaultvrsettings = JValue.Parse(reader.ReadToEnd());
+                reader.Close();
+                defaultvrsettings.driver_null.enable = true;
+
+                using (StreamWriter writer = new StreamWriter(steamPath + DRIVERS_DEFAULT_VRSETTINGS, false))
+                {
+                    writer.Write(defaultvrsettings.ToString());
+                }
+            }
+            Console.WriteLine("Patching default.vrsettings...");
+            using (StreamReader reader = new StreamReader(steamPath + DEFAULT_VRSETTINGS))
+            {
+                dynamic defaultvrsettings = JValue.Parse(reader.ReadToEnd());
+                reader.Close();
+                defaultvrsettings.steamvr.requireHmd = "false";
+                defaultvrsettings.steamvr.forcedDriver = "null";
+                defaultvrsettings.steamvr.activateMultipleDrivers = "true";
+
+                using (StreamWriter writer = new StreamWriter(steamPath + DEFAULT_VRSETTINGS, false))
+                {
+                    writer.Write(defaultvrsettings.ToString());
+                }
+            }
+            Console.WriteLine("Completed. You can now quit the application!");
+        }
+
+        private static void PatchToHmd(string steamPath)
+        {
+            Console.WriteLine("Patching drivers default.vrsettings...");
+            using (StreamReader reader = new StreamReader(steamPath + DRIVERS_DEFAULT_VRSETTINGS))
+            {
+                dynamic defaultvrsettings = JValue.Parse(reader.ReadToEnd());
+                reader.Close();
+                defaultvrsettings.driver_null.enable = false;
+
+                using (StreamWriter writer = new StreamWriter(steamPath + DRIVERS_DEFAULT_VRSETTINGS, false))
+                {
+                    writer.Write(defaultvrsettings.ToString());
+                }
+            }
+
+            Console.WriteLine("Patching default.vrsettings...");
+            using (StreamReader reader = new StreamReader(steamPath + DEFAULT_VRSETTINGS))
+            {
+                dynamic defaultvrsettings = JValue.Parse(reader.ReadToEnd());
+                reader.Close();
+                defaultvrsettings.steamvr.requireHmd = "true";
+                defaultvrsettings.steamvr.forcedDriver = "";
+                defaultvrsettings.steamvr.activateMultipleDrivers = "false";
+
+                using (StreamWriter writer = new StreamWriter(steamPath + DEFAULT_VRSETTINGS, false))
+                {
+                    writer.Write(defaultvrsettings.ToString());
+                }
+            }
+            Console.WriteLine("Completed. You can now quit the application!");
+        }
+    }
+}

SteamVRNoHeadsetModder/SteamVRNoHeadsetModder.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Win32.Registry" Version="4.7.0" />
+    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+  </ItemGroup>
+
+</Project>