diff --git a/.github/workflows/windows-binaries.yml b/.github/workflows/windows-binaries.yml
new file mode 100644
index 00000000..78343377
--- /dev/null
+++ b/.github/workflows/windows-binaries.yml
@@ -0,0 +1,211 @@
+#                          __  __            _
+#                       ___\ \/ /_ __   __ _| |_
+#                      / _ \\  /| '_ \ / _` | __|
+#                     |  __//  \| |_) | (_| | |_
+#                      \___/_/\_\ .__/ \__,_|\__|
+#                               |_| XML parser
+#
+# Copyright (c) 2025      Sebastian Pipping <sebastian@pipping.org>
+# Licensed under the MIT license:
+#
+# Permission is  hereby granted,  free of charge,  to any  person obtaining
+# a  copy  of  this  software   and  associated  documentation  files  (the
+# "Software"),  to  deal in  the  Software  without restriction,  including
+# without  limitation the  rights  to use,  copy,  modify, merge,  publish,
+# distribute, sublicense, and/or sell copies of the Software, and to permit
+# persons  to whom  the Software  is  furnished to  do so,  subject to  the
+# following conditions:
+#
+# The above copyright  notice and this permission notice  shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE  SOFTWARE  IS  PROVIDED  "AS  IS",  WITHOUT  WARRANTY  OF  ANY  KIND,
+# EXPRESS  OR IMPLIED,  INCLUDING  BUT  NOT LIMITED  TO  THE WARRANTIES  OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+# NO EVENT SHALL THE AUTHORS OR  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+# DAMAGES OR  OTHER LIABILITY, WHETHER  IN AN  ACTION OF CONTRACT,  TORT OR
+# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+# USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+name: Build Windows binaries
+
+on:
+  pull_request:
+  push:
+  schedule:
+    - cron: '0 2 * * 5'  # Every Friday at 2am
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  windows_binaries:
+    name: Build ${{ matrix.expat_platform }} binaries
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - runs-on: windows-2019
+            cmake_build_type: Debug
+            cmake_generator: Visual Studio 16 2019
+            cmake_platform: Win32
+            expat_char_type: char
+            expat_dll: libexpatd.dll
+            expat_platform: win32
+          - runs-on: windows-2019
+            cmake_build_type: Debug
+            cmake_generator: Visual Studio 16 2019
+            cmake_platform: x64
+            expat_char_type: wchar_t
+            expat_dll: libexpatwd.dll
+            expat_platform: win64
+    defaults:
+      run:
+        shell: bash
+    runs-on: "${{ matrix.runs-on }}"
+    steps:
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
+
+    - uses: microsoft/setup-msbuild@6fb02220983dee41ce7ae257b6f4d8f9bf5ed4ce  # v2
+
+    - name: Install Inno Setup
+      shell: pwsh
+      run: |-
+        Invoke-WebRequest -Uri https://files.jrsoftware.org/is/6/innosetup-6.1.2.exe -OutFile D:\\is.exe
+        Start-Process -FilePath D:\\is.exe -ArgumentList "/VERYSILENT", "/SUPPRESSMSGBOXES", "/NORESTART" -Wait
+
+    - name: 'Add Inno Setup compiler to ${PATH}'
+      run: |-
+        echo 'C:\Program Files (x86)\Inno Setup 6' >> "${GITHUB_PATH}"
+
+    - name: Install Innoextract
+      env:
+        version: 1.9
+      run: |-
+        set -x
+        mkdir innoextract
+        cd innoextract
+        export PATH="${PATH}:/c/msys64/usr/bin"  # for wget
+        wget -q https://github.com/dscharrer/innoextract/releases/download/${version}/innoextract-${version}-windows.zip
+        unzip innoextract-${version}-windows.zip
+        echo "${GITHUB_WORKSPACE}\innoextract" >> "${GITHUB_PATH}"
+
+    - name: Prepare win64 installer
+      if: "${{ matrix.expat_platform == 'win64' }}"
+      run: |-
+        bat_sed_args=(
+          -e 's,-A Win32,-A x64,g'
+          -e 's,win32,win64,g'
+        )
+        inno_sed_args=(
+          -e 's,^OutputDir=win32,OutputDir=win64,'
+          -e 's,win32bin,win64bin,'
+          -e 's,win32\\bin,win64\\bin,g'
+        )
+        set -x
+        cd expat
+        mkdir win64
+
+        sed "${bat_sed_args[@]}" win32/build_expat_iss.bat > win64/build_expat_iss.bat
+        ! grep -i win32 win64/build_expat_iss.bat  # i.e. assert success
+
+        sed "${inno_sed_args[@]}" win32/expat.iss > win64/expat.iss
+        ! grep 'win32\\bin' win64/expat.iss  # i.e. assert success
+        grep win32 win64/expat.iss  # purely informational
+    
+    - name: Build installer
+      env:
+        expat_platform: ${{ matrix.expat_platform }}
+      run: |-
+        set -x
+        cd expat
+
+        cmd < "${expat_platform}"/build_expat_iss.bat
+
+        ls -lh "${expat_platform}"/*.exe
+        cp -v "${expat_platform}"/expat-*bin-*.*.*.exe /d/expat-installer.exe
+
+    - name: Create .zip file from installer content
+      env:
+        expat_platform: ${{ matrix.expat_platform }}
+      run: |-
+        export PATH="${PATH}:/c/msys64/usr/bin"  # for zip
+        set -x
+
+        cd "expat/${expat_platform}"
+        zip_name="$(echo expat-*bin-*.exe | sed 's,\.exe$,.zip,')"
+
+        # Workaround issues with innoextract 1.9 as documented at
+        # https://github.com/dscharrer/innoextract/issues/178#issue-2505033557
+        innoextract -l expat-*bin-*.exe \
+            | awk -F'"' '{print $2}' \
+            | xargs dirname \
+            | sort -u \
+            | xargs mkdir -v -p
+
+        innoextract -e expat-*bin-*.exe
+
+        ls -lh app/Bin/
+
+        ( cd app && zip -9 -r ../"${zip_name}" . )
+
+    - name: Offer binaries for download
+      uses: actions/upload-artifact@65c4c4a1ddee5b72f698fdd19549f0f0fb45cf08  # v4.6.0
+      with:
+        name: expat_${{ matrix.expat_platform }}_${{ github.sha }}
+        path: expat/${{ matrix.expat_platform }}/expat-win*bin-*.*.*.*
+        if-no-files-found: error
+
+    - name: Run installer
+      shell: pwsh
+      run: |-
+        Start-Process -FilePath D:\\expat-installer.exe -ArgumentList "/VERYSILENT", "/SUPPRESSMSGBOXES", "/NORESTART" -Wait
+
+    - name: Build installed code — Configure
+      env:
+        cmake_build_type: ${{ matrix.cmake_build_type }}
+        cmake_generator: ${{ matrix.cmake_generator }}
+        cmake_platform: ${{ matrix.cmake_platform }}
+        expat_char_type: ${{ matrix.expat_char_type }}
+      run: |-
+        cmake_args=(
+          -A "${cmake_platform}"
+          -G "${cmake_generator}"
+          -DCMAKE_BUILD_TYPE="${cmake_build_type}"
+          -DEXPAT_CHAR_TYPE="${expat_char_type}"
+          -DEXPAT_WARNINGS_AS_ERRORS=ON
+          -Wdev
+          -Wdeprecated
+        )
+        set -x
+        cd '/c/Program Files (x86)/Expat '*/Source
+        mkdir build
+        cmake -S . -B build "${cmake_args[@]}"
+
+    - name: Build installed code — Build
+      env:
+        cmake_build_type: ${{ matrix.cmake_build_type }}
+      run: |-
+        msbuild_args=(
+          -m
+          -property:Configuration="${cmake_build_type}"
+        )
+        set -x
+        cd '/c/Program Files (x86)/Expat '*/Source/build
+        MSBuild.exe "${msbuild_args[@]}" expat.sln
+
+    - name: Build installed code — Run tests
+      env:
+        cmake_build_type: ${{ matrix.cmake_build_type }}
+        expat_dll: ${{ matrix.expat_dll }}
+      run: |-
+        ctest_args=(
+          --build-config "${cmake_build_type}"
+          --output-on-failure
+          --parallel 2
+        )
+        set -x
+        cd '/c/Program Files (x86)/Expat '*/Source/build
+        cp -v "${cmake_build_type}/${expat_dll}" "tests/${cmake_build_type}/"
+        ctest "${ctest_args[@]}"
diff --git a/.github/workflows/windows-build.yml b/.github/workflows/windows-build.yml
new file mode 100644
index 00000000..851b2483
--- /dev/null
+++ b/.github/workflows/windows-build.yml
@@ -0,0 +1,116 @@
+#                          __  __            _
+#                       ___\ \/ /_ __   __ _| |_
+#                      / _ \\  /| '_ \ / _` | __|
+#                     |  __//  \| |_) | (_| | |_
+#                      \___/_/\_\ .__/ \__,_|\__|
+#                               |_| XML parser
+#
+# Copyright (c) 2025      Sebastian Pipping <sebastian@pipping.org>
+# Licensed under the MIT license:
+#
+# Permission is  hereby granted,  free of charge,  to any  person obtaining
+# a  copy  of  this  software   and  associated  documentation  files  (the
+# "Software"),  to  deal in  the  Software  without restriction,  including
+# without  limitation the  rights  to use,  copy,  modify, merge,  publish,
+# distribute, sublicense, and/or sell copies of the Software, and to permit
+# persons  to whom  the Software  is  furnished to  do so,  subject to  the
+# following conditions:
+#
+# The above copyright  notice and this permission notice  shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE  SOFTWARE  IS  PROVIDED  "AS  IS",  WITHOUT  WARRANTY  OF  ANY  KIND,
+# EXPRESS  OR IMPLIED,  INCLUDING  BUT  NOT LIMITED  TO  THE WARRANTIES  OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+# NO EVENT SHALL THE AUTHORS OR  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+# DAMAGES OR  OTHER LIABILITY, WHETHER  IN AN  ACTION OF CONTRACT,  TORT OR
+# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+# USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+name: Build on Windows
+
+on:
+  pull_request:
+  push:
+  schedule:
+    - cron: '0 2 * * 5'  # Every Friday at 2am
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  windows_build:
+    name: Build on Windows (${{ matrix.runs-on }}, ${{ matrix.cmake_platform }}, ${{ matrix.expat_char_type }})
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - runs-on: windows-2019
+            cmake_build_type: Debug
+            cmake_generator: Visual Studio 16 2019
+            cmake_platform: Win32
+            expat_char_type: char
+            expat_dll: libexpatd.dll
+          - runs-on: windows-2022
+            cmake_build_type: Debug
+            cmake_generator: Visual Studio 17 2022
+            cmake_platform: x64
+            expat_char_type: wchar_t
+            expat_dll: libexpatwd.dll
+    defaults:
+      run:
+        shell: bash
+    runs-on: "${{ matrix.runs-on }}"
+    steps:
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
+
+    - uses: microsoft/setup-msbuild@6fb02220983dee41ce7ae257b6f4d8f9bf5ed4ce  # v2
+
+    - name: Configure
+      env:
+        cmake_build_type: ${{ matrix.cmake_build_type }}
+        cmake_generator: ${{ matrix.cmake_generator }}
+        cmake_platform: ${{ matrix.cmake_platform }}
+        expat_char_type: ${{ matrix.expat_char_type }}
+      run: |-
+        cmake_args=(
+          -A "${cmake_platform}"
+          -G "${cmake_generator}"
+          -DCMAKE_BUILD_TYPE="${cmake_build_type}"
+          -DEXPAT_CHAR_TYPE="${expat_char_type}"
+          -DEXPAT_WARNINGS_AS_ERRORS=ON
+          -Wdev
+          -Wdeprecated
+        )
+        set -x
+        cd expat
+        mkdir build
+        cmake -S . -B build "${cmake_args[@]}"
+
+    - name: Build
+      env:
+        cmake_build_type: ${{ matrix.cmake_build_type }}
+      run: |-
+        msbuild_args=(
+          -m
+          -property:Configuration="${cmake_build_type}"
+        )
+        set -x
+        cd expat/build
+        MSBuild.exe "${msbuild_args[@]}" expat.sln
+
+    - name: Run tests
+      env:
+        cmake_build_type: ${{ matrix.cmake_build_type }}
+        expat_dll: ${{ matrix.expat_dll }}
+      run: |-
+        ctest_args=(
+          --build-config "${cmake_build_type}"
+          --output-on-failure
+          --parallel 2
+        )
+        set -x
+        cd expat/build
+        cp -v "${cmake_build_type}/${expat_dll}" "tests/${cmake_build_type}/"
+        ctest "${ctest_args[@]}"
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index 8ac58020..00000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,120 +0,0 @@
-# AppVeyor configuration
-#                          __  __            _
-#                       ___\ \/ /_ __   __ _| |_
-#                      / _ \\  /| '_ \ / _` | __|
-#                     |  __//  \| |_) | (_| | |_
-#                      \___/_/\_\ .__/ \__,_|\__|
-#                               |_| XML parser
-#
-# Copyright (c) 2017      José Gutiérrez de la Concha <jose@zeroc.com>
-# Copyright (c) 2017-2023 Sebastian Pipping <sebastian@pipping.org>
-# Copyright (c) 2017      Franek Korta <fkorta@gmail.com>
-# Licensed under the MIT license:
-#
-# Permission is  hereby granted,  free of charge,  to any  person obtaining
-# a  copy  of  this  software   and  associated  documentation  files  (the
-# "Software"),  to  deal in  the  Software  without restriction,  including
-# without  limitation the  rights  to use,  copy,  modify, merge,  publish,
-# distribute, sublicense, and/or sell copies of the Software, and to permit
-# persons  to whom  the Software  is  furnished to  do so,  subject to  the
-# following conditions:
-#
-# The above copyright  notice and this permission notice  shall be included
-# in all copies or substantial portions of the Software.
-#
-# THE  SOFTWARE  IS  PROVIDED  "AS  IS",  WITHOUT  WARRANTY  OF  ANY  KIND,
-# EXPRESS  OR IMPLIED,  INCLUDING  BUT  NOT LIMITED  TO  THE WARRANTIES  OF
-# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-# NO EVENT SHALL THE AUTHORS OR  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-# DAMAGES OR  OTHER LIABILITY, WHETHER  IN AN  ACTION OF CONTRACT,  TORT OR
-# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-# USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-# scripts that are called at very beginning, before repo cloning
-init:
-- git config --global core.autocrlf input
-
-# version format
-version: libexpat-{build}
-
-# set clone depth, clone entire repository history if not defined
-clone_depth: 50
-
-# clone directory
-clone_folder: c:\projects\libexpat
-
-configuration: Debug
-
-# AppVeyor pre-installed software:
-# https://www.appveyor.com/docs/build-environment/#pre-installed-software
-#
-# CMake Visual Studio generators:
-# https://cmake.org/cmake/help/latest/manual/cmake-generators.7.html#visual-studio-generators
-environment:
-  matrix:
-    # Visual Studio 2019 Win32
-    - GENERATOR: Visual Studio 16 2019
-      PLATFORM: Win32
-      CMAKE_ARGS: -A Win32
-      EXPAT_DLL: libexpatd.dll
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-
-    # Visual Studio 2019 Win32 XML_UNICODE_WCHAR_T
-    - GENERATOR: Visual Studio 16 2019
-      PLATFORM: Win32
-      CMAKE_ARGS: -A Win32 -DEXPAT_CHAR_TYPE=wchar_t
-      EXPAT_DLL: libexpatwd.dll
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-
-    # Visual Studio 2019 x64
-    - GENERATOR: Visual Studio 16 2019
-      PLATFORM: x64
-      EXPAT_DLL: libexpatd.dll
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-
-    # Visual Studio 2019 x64 XML_UNICODE_WCHAR_T
-    - GENERATOR: Visual Studio 16 2019
-      PLATFORM: x64
-      CMAKE_ARGS: -DEXPAT_CHAR_TYPE=wchar_t
-      EXPAT_DLL: libexpatwd.dll
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-
-    # Visual Studio 2022 Win32
-    - GENERATOR: Visual Studio 17 2022
-      PLATFORM: Win32
-      CMAKE_ARGS: -A Win32
-      EXPAT_DLL: libexpatd.dll
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
-
-    # Visual Studio 2022 Win32 XML_UNICODE_WCHAR_T
-    - GENERATOR: Visual Studio 17 2022
-      PLATFORM: Win32
-      CMAKE_ARGS: -A Win32 -DEXPAT_CHAR_TYPE=wchar_t
-      EXPAT_DLL: libexpatwd.dll
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
-
-    # Visual Studio 2022 x64
-    - GENERATOR: Visual Studio 17 2022
-      PLATFORM: x64
-      EXPAT_DLL: libexpatd.dll
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
-
-    # Visual Studio 2022 x64 XML_UNICODE_WCHAR_T
-    - GENERATOR: Visual Studio 17 2022
-      PLATFORM: x64
-      CMAKE_ARGS: -DEXPAT_CHAR_TYPE=wchar_t
-      EXPAT_DLL: libexpatwd.dll
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
-
-before_build:
-  - echo Running cmake...
-  - cd c:\projects\libexpat
-  - cmake -G"%GENERATOR%" -DCMAKE_BUILD_TYPE=%CONFIGURATION% -DEXPAT_WARNINGS_AS_ERRORS=ON %CMAKE_ARGS% expat
-
-build:
-  parallel: true                  # enable MSBuild parallel builds
-  project: expat.sln              # path to Visual Studio solution or project
-
-test_script:
-  - cp %CONFIGURATION%\\%EXPAT_DLL% tests\\%CONFIGURATION%\\
-  - ctest --build-config %CONFIGURATION% --output-on-failure --parallel 2
diff --git a/expat/Changes b/expat/Changes
index 82e2f663..f5f7de12 100644
--- a/expat/Changes
+++ b/expat/Changes
@@ -20,7 +20,6 @@
 !!   (needs discussion before pull requests),                                !!
 !! - smart ideas on fixing the Autotools CMake files generation issue        !!
 !!   without breaking CI (needs discussion before pull requests),            !!
-!! - the Windows binaries topic (needs requirements engineering first),      !!
 !! - pushing migration from `int` to `size_t` further                        !!
 !!   including edge-cases test coverage (needs discussion before anything).  !!
 !!                                                                           !!