diff --git a/README.md b/README.md
index b6e20900..f43a59a9 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+CLTEST
+
 # Netch
 [![](https://img.shields.io/badge/Telegram-Channel-blue.svg)](https://t.me/Netch)
 
diff --git a/build.ps1 b/build.ps1
new file mode 100644
index 00000000..5f0282df
--- /dev/null
+++ b/build.ps1
@@ -0,0 +1,116 @@
+# REM The reason we don't use dotnet build is that dotnet build doesn't support COM references yet https://github.com/microsoft/msbuild/issues/3986
+param([string]$buildtfm = 'all')
+
+Write-Host 'dotnet SDK version'
+dotnet --version
+
+$exe = 'ShadowsocksR.exe'
+$net_tfm = 'net48'
+$netcore_tfm = 'netcoreapp3.1'
+$configuration = 'Release'
+$mainDir = (Get-Item -Path ".\").FullName
+$net_baseoutput = "$mainDir\shadowsocks-csharp\bin\$configuration"
+$apphostpatcher_dir = "$mainDir\AppHostPatcher"
+
+Write-Host $mainDir
+Write-Host $net_baseoutput
+Write-Host $apphostpatcher_dir
+
+$buildNet     = $buildtfm -eq 'all' -or $buildtfm -eq 'net'
+
+function Build-AppHostPatcher
+{
+	Write-Host Building AppHostPatcher
+	
+	$outdir = "$apphostpatcher_dir\bin\$configuration\$netcore_tfm"
+	$publishDir = "$outdir\publish"
+	
+	Remove-Item $publishDir -Recurse -Force -Confirm:$false -ErrorAction Ignore
+	
+	msbuild -v:m -m -r -t:Publish -p:Configuration=$configuration -p:TargetFramework=$netcore_tfm
+	if ($LASTEXITCODE) { cd $mainDir ; exit $LASTEXITCODE }
+}
+
+function Build-NetFramework
+{
+	Write-Host 'Building .NET Framework x86 and x64'
+	
+	$outdir = "$net_baseoutput\$net_tfm"
+	
+	msbuild -v:m -m -r -t:Build -p:Configuration=$configuration -p:TargetFramework=$net_tfm
+	if ($LASTEXITCODE) { cd $mainDir ; exit $LASTEXITCODE }
+}
+
+function Build-NetCore
+{
+	Write-Host 'Building .NET Core'
+	
+	$outdir = "$net_baseoutput\$netcore_tfm"
+	$publishDir = "$outdir\publish"
+
+	Remove-Item $publishDir -Recurse -Force -Confirm:$false -ErrorAction Ignore
+	
+	msbuild -v:m -m -r -t:Publish -p:Configuration=$configuration -p:TargetFramework=$netcore_tfm
+	if ($LASTEXITCODE) { cd $mainDir ; exit $LASTEXITCODE }
+
+	$tmpbin = 'tmpbin'
+	Rename-Item $publishDir $tmpbin
+	New-Item -ItemType Directory $publishDir > $null
+	Move-Item $outdir\$tmpbin $publishDir
+	Rename-Item $publishDir\$tmpbin bin
+
+	Move-Item $publishDir\bin\$exe $publishDir
+	& $apphostpatcher_dir\bin\$configuration\$netcore_tfm\AppHostPatcher.exe $publishDir\$exe -d bin
+	if ($LASTEXITCODE) { cd $mainDir ; exit $LASTEXITCODE }
+}
+
+function Build-NetCoreSelfContained
+{
+	param([string]$arch)
+	Write-Host "Building .NET Core $arch"
+
+	$rid = "win-$arch"
+	$outdir = "$net_baseoutput\$netcore_tfm\$rid"
+	$publishDir = "$outdir\publish"
+
+	Remove-Item $publishDir -Recurse -Force -Confirm:$false -ErrorAction Ignore
+	
+	msbuild -v:m -m -r -t:Publish -p:Configuration=$configuration -p:TargetFramework=$netcore_tfm -p:RuntimeIdentifier=$rid -p:SelfContained=True -p:PublishReadyToRun=True
+	if ($LASTEXITCODE) { cd $mainDir ; exit $LASTEXITCODE }
+	
+	$tmpbin = 'tmpbin'
+	Rename-Item $publishDir $tmpbin
+	New-Item -ItemType Directory $publishDir > $null
+	Move-Item $outdir\$tmpbin $publishDir
+	Rename-Item $publishDir\$tmpbin bin
+	
+	Move-Item $publishDir\bin\$exe $publishDir
+	& $apphostpatcher_dir\bin\$configuration\$netcore_tfm\AppHostPatcher.exe $publishDir\$exe -d bin
+	if ($LASTEXITCODE) { cd $mainDir ; exit $LASTEXITCODE }
+}
+
+if ($buildCore -or $buildCoreX86 -or $buildCoreX64)
+{
+	cd $apphostpatcher_dir
+	Build-AppHostPatcher
+}
+
+cd $mainDir\shadowsocks-csharp
+
+if ($buildNet) {
+	Build-NetFramework
+}
+
+if ($buildCore) {
+	Build-NetCore
+}
+
+if ($buildCoreX86) {
+	Build-NetCoreSelfContained x86
+}
+
+if ($buildCoreX64) {
+	Build-NetCoreSelfContained x64
+}
+
+cd $mainDir
\ No newline at end of file