diff --git a/.appveyor.yml b/.appveyor.yml
new file mode 100644
index 0000000..8ae24c9
--- /dev/null
+++ b/.appveyor.yml
@@ -0,0 +1,67 @@
+# general configuration
+version: '{branch}.{build}'
+
+# environment configuration
+image: Visual Studio 2017
+clone_folder: c:\projects\snappy
+environment:
+  BIN_SDK_VER: 2.2.0
+  matrix:
+    - PHP_VER: 7.2
+      ARCH: x64
+      TS: 0
+      VC: vc15
+      VCPKG: 0
+    - PHP_VER: 7.2
+      ARCH: x86
+      TS: 1
+      VC: vc15
+      VCPKG: 0
+    - PHP_VER: 7.3
+      ARCH: x64
+      TS: 0
+      VC: vc15
+      VCPKG: 0
+    - PHP_VER: 7.3
+      ARCH: x86
+      TS: 1
+      VC: vc15
+      VCPKG: 0
+    - PHP_VER: 7.4
+      ARCH: x64
+      TS: 0
+      VC: vc15
+      VCPKG: 0
+    - PHP_VER: 7.4
+      ARCH: x86
+      TS: 1
+      VC: vc15
+      VCPKG: 0
+    - PHP_VER: 7.4
+      ARCH: x64
+      TS: 0
+      VC: vc15
+      VCPKG: 1
+    - PHP_VER: 7.4
+      ARCH: x86
+      TS: 1
+      VC: vc15
+      VCPKG: 1
+cache:
+  - c:\build-cache -> .appveyor.yml, .appveyor\install.ps1
+install:
+  - ps: .appveyor\install.ps1
+  - ps: .appveyor\install_submodule.ps1
+  - ps: .appveyor\install_vcpkg.ps1
+
+# build configuration
+build_script:
+  - ps: .appveyor\build.ps1
+
+# tests configuration
+test_script:
+  - ps: .appveyor\test.ps1
+
+# artifacts configuration
+artifacts:
+  - path: php_snappy.dll
diff --git a/.appveyor/build.ps1 b/.appveyor/build.ps1
new file mode 100644
index 0000000..f7c7d09
--- /dev/null
+++ b/.appveyor/build.ps1
@@ -0,0 +1,29 @@
+$ErrorActionPreference = "Stop"
+
+Set-Location C:\projects\snappy
+
+$task = New-Item 'task.bat' -Force
+Add-Content $task 'call phpize 2>&1'
+Add-Content $task 'call configure --with-php-build=C:\build-cache\deps --enable-snappy --enable-debug-pack 2>&1'
+Add-Content $task 'nmake /nologo 2>&1'
+Add-Content $task 'exit %errorlevel%'
+& "C:\build-cache\php-sdk-$env:BIN_SDK_VER\phpsdk-$env:VC-$env:ARCH.bat" -t $task
+if (-not $?) {
+    throw "building failed with errorlevel $LastExitCode"
+}
+
+$dname = ''
+if ($env:ARCH -eq 'x64') {
+    $dname += 'x64\'
+}
+$dname += 'Release';
+if ($env:TS -eq '1') {
+    $dname += '_TS'
+}
+Copy-Item "$dname\php_snappy.dll" "$env:PHP_PATH\ext\php_snappy.dll"
+Copy-Item "$dname\php_snappy.dll" "php_snappy.dll"
+
+$ini = New-Item "$env:PHP_PATH\php.ini" -Force
+Add-Content $ini "extension_dir=$env:PHP_PATH\ext"
+Add-Content $ini 'extension=php_openssl.dll'
+Add-Content $ini 'extension=php_snappy.dll'
diff --git a/.appveyor/install.ps1 b/.appveyor/install.ps1
new file mode 100644
index 0000000..54f016c
--- /dev/null
+++ b/.appveyor/install.ps1
@@ -0,0 +1,78 @@
+$ErrorActionPreference = "Stop"
+
+if (-not (Test-Path 'C:\build-cache')) {
+    [void](New-Item 'C:\build-cache' -ItemType 'directory')
+}
+
+# PHP SDK
+$bname = "php-sdk-$env:BIN_SDK_VER.zip"
+if (-not (Test-Path C:\build-cache\$bname)) {
+    Invoke-WebRequest "https://github.com/microsoft/php-sdk-binary-tools/archive/$bname" -OutFile "C:\build-cache\$bname"
+}
+$dname0 = "php-sdk-binary-tools-php-sdk-$env:BIN_SDK_VER"
+$dname1 = "php-sdk-$env:BIN_SDK_VER"
+if (-not (Test-Path "C:\build-cache\$dname1")) {
+    Expand-Archive "C:\build-cache\$bname" "C:\build-cache"
+    Move-Item "C:\build-cache\$dname0" "C:\build-cache\$dname1"
+}
+
+# PHP releases
+Invoke-WebRequest "https://windows.php.net/downloads/releases/releases.json" -OutFile "C:\build-cache\releases.json"
+$php_version = (Get-Content -Path "C:\build-cache\releases.json" | ConvertFrom-Json | ForEach-Object {
+    if ($_."$env:PHP_VER") {
+        return $_."$env:PHP_VER".version
+    } else {
+        return "$env:PHP_VER"
+    }
+})
+
+# PHP devel pack
+$ts_part = ''
+if ('0' -eq $env:TS) {
+    $ts_part = '-nts'
+}
+$bname = "php-devel-pack-$php_version$ts_part-Win32-$env:VC-$env:ARCH.zip"
+if (-not (Test-Path "C:\build-cache\$bname")) {
+    try {
+        Invoke-WebRequest "https://windows.php.net/downloads/releases/$bname" -OutFile "C:\build-cache\$bname"
+    } catch [System.Net.WebException] {
+        Invoke-WebRequest "https://windows.php.net/downloads/releases/archives/$bname" -OutFile "C:\build-cache\$bname"
+    }
+}
+$dname0 = "php-$php_version-devel-$env:VC-$env:ARCH"
+$dname1 = "php-$php_version$ts_part-devel-$env:VC-$env:ARCH"
+if (-not (Test-Path "C:\build-cache\$dname1")) {
+    Expand-Archive "C:\build-cache\$bname" 'C:\build-cache'
+    if (-not (Test-Path "C:\build-cache\$dname0")) {
+        $php_normalize_version = $php_version.Split("-")[0]
+        $dname0 = "php-$php_normalize_version-devel-$env:VC-$env:ARCH"
+    }
+    if ($dname0 -ne $dname1) {
+        Move-Item "C:\build-cache\$dname0" "C:\build-cache\$dname1"
+    }
+}
+$env:PATH = "C:\build-cache\$dname1;$env:PATH"
+
+# PHP binary
+$bname = "php-$php_version$ts_part-Win32-$env:VC-$env:ARCH.zip"
+if (-not (Test-Path "C:\build-cache\$bname")) {
+    try {
+        Invoke-WebRequest "https://windows.php.net/downloads/releases/$bname" -OutFile "C:\build-cache\$bname"
+    } catch [System.Net.WebException] {
+        Invoke-WebRequest "https://windows.php.net/downloads/releases/archives/$bname" -OutFile "C:\build-cache\$bname"
+    }
+}
+$dname = "php-$php_version$ts_part-Win32-$env:VC-$env:ARCH"
+if (-not (Test-Path "C:\build-cache\$dname")) {
+    Expand-Archive "C:\build-cache\$bname" "C:\build-cache\$dname"
+}
+$env:PHP_PATH = "C:\build-cache\$dname"
+$env:PATH = "$env:PHP_PATH;$env:PATH"
+
+# # library dependency
+# $bname = "$env:DEP-$env:VC-$env:ARCH.zip"
+# if (-not (Test-Path "C:\build-cache\$bname")) {
+#     Invoke-WebRequest "https://windows.php.net/downloads/pecl/deps/$bname" -OutFile "C:\build-cache\$bname"
+#     Expand-Archive "C:\build-cache\$bname" 'C:\build-cache\deps'
+# }
+$env:PATH = "C:\build-cache\deps\bin;$env:PATH"
diff --git a/.appveyor/install_submodule.ps1 b/.appveyor/install_submodule.ps1
new file mode 100644
index 0000000..6ab69c4
--- /dev/null
+++ b/.appveyor/install_submodule.ps1
@@ -0,0 +1,15 @@
+$ErrorActionPreference = "Stop"
+
+Set-Location C:\projects\snappy
+
+if ($env:VCPKG -eq '0') {
+    $command = "git"
+    $args = "submodule update --init --recursive"
+    $process = Start-Process $command -ArgumentList $args -Wait -NoNewWindow -PassThru
+    if ($process.ExitCode -ne 0) {
+        Write-Error -Category InvalidResult -Message "$command exits with $($process.ExitCode)"
+    }
+
+    # Create "snappy\snappy-stubs-public.h"
+    Get-Content "snappy\snappy-stubs-public.h.in" | ForEach-Object { $_ -replace '\${HAVE_SYS_UIO_H_01}', "0" } | Out-File "snappy\snappy-stubs-public.h"
+}
diff --git a/.appveyor/install_vcpkg.ps1 b/.appveyor/install_vcpkg.ps1
new file mode 100644
index 0000000..09e59d6
--- /dev/null
+++ b/.appveyor/install_vcpkg.ps1
@@ -0,0 +1,14 @@
+$ErrorActionPreference = "Stop"
+
+if ($env:VCPKG -eq '1' -and -not (Test-Path 'C:\build-cache\deps')) {
+    [void](New-Item 'C:\build-cache\deps' -ItemType 'directory')
+
+    vcpkg install "snappy:$env:ARCH-windows"
+    if (-not $?) {
+        throw "installing failed with errorlevel $LastExitCode"
+    }
+
+    Copy-Item "C:\tools\vcpkg\installed\$env:ARCH-windows\bin" "C:\build-cache\deps" -Recurse -Force
+    Copy-Item "C:\tools\vcpkg\installed\$env:ARCH-windows\include" "C:\build-cache\deps" -Recurse -Force
+    Copy-Item "C:\tools\vcpkg\installed\$env:ARCH-windows\lib" "C:\build-cache\deps" -Recurse -Force
+}
diff --git a/.appveyor/test.ps1 b/.appveyor/test.ps1
new file mode 100644
index 0000000..35b3690
--- /dev/null
+++ b/.appveyor/test.ps1
@@ -0,0 +1,9 @@
+$ErrorActionPreference = "Stop"
+
+Set-Location C:\projects\snappy
+
+$env:TEST_PHP_EXECUTABLE = "$env:PHP_PATH\php.exe"
+& $env:TEST_PHP_EXECUTABLE 'run-tests.php' --show-diff tests
+if (-not $?) {
+    throw "testing failed with errorlevel $LastExitCode"
+}
diff --git a/README.md b/README.md
index 16e56b8..03a5a7e 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # Snappy Extension for PHP
 
 [![Build Status](https://secure.travis-ci.org/kjdev/php-ext-snappy.png?branch=master)](http://travis-ci.org/kjdev/php-ext-snappy)
+[![Build status](https://ci.appveyor.com/api/projects/status/20i7jiflddmfhkus/branch/master?svg=true)](https://ci.appveyor.com/project/kjdev/php-ext-snappy/branch/master)
 
 This extension allows Snappy.
 
diff --git a/config.w32 b/config.w32
index e2d9aa7..641d7b9 100644
--- a/config.w32
+++ b/config.w32
@@ -1,7 +1,14 @@
-ARG_ENABLE("snappy", "enable snappy support", "no");
+ARG_ENABLE("snappy", "enable snappy support", "yes");
 
 if (PHP_SNAPPY != "no") {
-  EXTENSION("snappy", "snappy.c", PHP_SNAPPY_SHARED, "");
-  ADD_SOURCES(configure_module_dirname + "/snappy", "snappy-c.cc snappy.cc snappy-stubs-internal.cc snappy-sinksource.cc", "snappy");
+  if (CHECK_LIB("snappy.lib;libsnappy.lib", "snappy", PHP_SNAPPY) &&
+      CHECK_HEADER_ADD_INCLUDE("snappy-c.h", "CFLAGS_SNAPPY", PHP_SNAPPY)) {
+    EXTENSION("snappy", "snappy.c", PHP_SNAPPY_SHARED, "/DZEND_ENABLE_STATIC_TSRMLS_CACHE=1");
+  } else {
+    EXTENSION("snappy", "snappy.c", PHP_SNAPPY_SHARED, "/DZEND_ENABLE_STATIC_TSRMLS_CACHE=1");
+    ADD_SOURCES("snappy", "snappy-c.cc snappy.cc snappy-stubs-internal.cc snappy-sinksource.cc", "snappy", "snappy");
+    ADD_FLAG("CFLAGS_SNAPPY", " /I" + configure_module_dirname + " /I" + configure_module_dirname + "/snappy");
+    // TODO: Need to create snappy/snappy-stubs-public.h
+  }
   PHP_INSTALL_HEADERS("ext/snappy/", "php_snappy.h");
 }