diff --git a/config/README.rst b/config/README.rst
index 436f2b7..b3e4723 100644
--- a/config/README.rst
+++ b/config/README.rst
@@ -157,9 +157,6 @@ The following options are only needed one time as their values are stored in
   Define the configuration type (see `Types`_ section above) to be used for the
   repository.
 
---with-appveyor
-  Enable running the tests on AppVeyor, too.
-
 --with-macos
   Enable running the tests on macOS on GitHub Actions.
 
@@ -204,7 +201,6 @@ updated. Example:
     commit-id = "< commit-hash >"
 
     [python]
-    with-appveyor = false
     with-pypy = false
     with-docs = true
     with-sphinx-doctests = false
@@ -328,36 +324,6 @@ updated. Example:
         "tox -f ${{ matrix.config[1] }}",
         ]
 
-    [appveyor]
-    global-env-vars = [
-        "ZOPE_INTERFACE_STRICT_IRO: 1",
-        ]
-    additional-matrix = [
-        "- { PYTHON: 38, PURE_PYTHON: 1 }",
-        "- { PYTHON: 38-x64, PURE_PYTHON: 1 }",
-        ]
-    install-steps = [
-        "- pip install zc.buildout",
-        "- buildout",
-        ]
-    build-script = [
-        "- python -W ignore setup.py -q bdist_wheel",
-        ]
-    test-steps = [
-        "- zope-testrunner --test-path=src",
-        "- jasmine",
-        ]
-    additional-lines = [
-        "artifacts:",
-        "  - path: 'dist\*.whl'",
-        "    name: wheel",
-        ]
-    replacement = [
-        "environment:",
-        "  matrix:",
-        "    ...",
-        ]
-
     [c-code]
     manylinux-install-setup = [
         "export CFLAGS=\"-pipe\"",
@@ -402,9 +368,6 @@ commit-id
 Python options
 ``````````````
 
-with-appveyor
-  Run the tests also on AppVeyor: true/false
-
 with-macos
   Run the tests also on macOS on GitHub Actions: true/false, default: false
 
@@ -636,46 +599,6 @@ test-commands
   This option has to be a list of strings.
 
 
-AppVeyor options
-````````````````
-
-The corresponding section is named: ``[appveyor]``.
-
-global-env-vars
-  Environment variables to specify globally. This option has to be a list of
-  strings.
-
-additional-matrix
-  Additional environment matrix rows.  This option has to be a list of strings,
-  each starting with a ``-`` (unless you know what you're doing).
-
-install-steps
-  Steps to install the package under test on AppVeyor. This option has to be a
-  list of strings. It defaults to ``["- pip install -U -e .[test]"]``.
-
-build-script
-  Steps to to build the project. If this option is not given because no
-  additional build steps are necessary ``build: false`` is rendered to the
-  AppVeyor configuration. But if the config type is ``c-code`` it defaults to
-  ``['- python -W ignore setup.py -q bdist_wheel']``. This option has to be a
-  list of strings, each one starting with a ``-``.
-
-test-steps
-  Steps to run the tests on AppVeyor. This option has to be a list of strings
-  , each one starting with a ``-``.  It defaults to
-  ``["- zope-testrunner --test-path=src"]``.
-
-additional-lines
-  This option allows to add arbitrary additional lines to the end of the
-  configuration file. It has to be a list of strings.
-
-replacement
-  Replace the whole template of the AppVeyor configuration with the contents of
-  this option. Use this option as last resort if your needed changes are too
-  big to configure AppVeyor in another way. This option has to be a list of
-  strings.
-
-
 C-code options
 ``````````````
 
diff --git a/config/buildout-recipe/packages.txt b/config/buildout-recipe/packages.txt
index 18a73f4..a327657 100644
--- a/config/buildout-recipe/packages.txt
+++ b/config/buildout-recipe/packages.txt
@@ -9,7 +9,6 @@ z3c.recipe.i18n
 zc.recipe.cmmi
 zdaemon
 zc.recipe.filestorage
-five.customerize
 z3c.recipe.compattest
 zc.relation
 zc.zodbrecipes
diff --git a/config/c-code/appveyor-publish.j2 b/config/c-code/appveyor-publish.j2
deleted file mode 100644
index b5b2113..0000000
--- a/config/c-code/appveyor-publish.j2
+++ /dev/null
@@ -1,8 +0,0 @@
-artifacts:
-  - path: 'dist\*.whl'
-    name: wheel
-
-deploy_script:
-  - ps: if ($env:APPVEYOR_REPO_TAG -eq $TRUE) { pip install twine; twine upload --skip-existing dist\*.whl }
-
-deploy: on
diff --git a/config/c-code/tests-cache.j2 b/config/c-code/tests-cache.j2
index bbb0410..f19b1d2 100644
--- a/config/c-code/tests-cache.j2
+++ b/config/c-code/tests-cache.j2
@@ -10,15 +10,32 @@
       # to save the cache. So it must come before the thing we want to use
       # the cache.
       ###
-      - name: Get pip cache dir
-        id: pip-cache
+      - name: Get pip cache dir (default)
+        id: pip-cache-default
+        if: ${{ !startsWith(runner.os, 'Windows') }}
         run: |
           echo "dir=$(pip cache dir)" >>$GITHUB_OUTPUT
 
-      - name: pip cache
+      - name: Get pip cache dir (Windows)
+        id: pip-cache-windows
+        if: ${{ startsWith(runner.os, 'Windows') }}
+        run: |
+          echo "dir=$(pip cache dir)" >> $Env:GITHUB_OUTPUT
+
+      - name: pip cache (default)
+        uses: actions/cache@v4
+        if: ${{ !startsWith(runner.os, 'Windows') }}
+        with:
+          path: ${{ steps.pip-cache-default.outputs.dir }}
+          key: %(cache_key)s
+          restore-keys: |
+            ${{ runner.os }}-pip-
+
+      - name: pip cache (Windows)
         uses: actions/cache@v4
+        if: ${{ startsWith(runner.os, 'Windows') }}
         with:
-          path: ${{ steps.pip-cache.outputs.dir }}
+          path: ${{ steps.pip-cache-windows.outputs.dir }}
           key: %(cache_key)s
           restore-keys: |
             ${{ runner.os }}-pip-
diff --git a/config/c-code/tests-strategy.j2 b/config/c-code/tests-strategy.j2
index 8885aed..2a15505 100644
--- a/config/c-code/tests-strategy.j2
+++ b/config/c-code/tests-strategy.j2
@@ -14,7 +14,11 @@
 {% if with_future_python %}
           - "%(future_python_version)s"
 {% endif %}
+{% if with_windows %}
+        os: [ubuntu-20.04, macos-11, windows-latest]
+{% else %}
         os: [ubuntu-20.04, macos-11]
+{% endif %}
 {% if with_pypy or gha_additional_exclude %}
         exclude:
 {% endif %}
diff --git a/config/c-code/tests.yml.j2 b/config/c-code/tests.yml.j2
index 2ada6bc..6d69525 100644
--- a/config/c-code/tests.yml.j2
+++ b/config/c-code/tests.yml.j2
@@ -97,8 +97,10 @@ jobs:
 {% include 'tests-cache.j2' %}
 
 {% if with_future_python %}
-      - name: Install Build Dependencies (%(future_python_version)s)
-        if: matrix.python-version == '%(future_python_version)s'
+      - name: Install Build Dependencies (%(future_python_version)s) - no Windows
+        if: >
+          matrix.python-version == '%(future_python_version)s'
+          && !startsWith(runner.os, 'Windows')
         run: |
           pip install -U pip
           pip install -U setuptools wheel twine
@@ -106,6 +108,18 @@ jobs:
           # or even RC release, see https://github.com/python-cffi/cffi/issues/23
           echo "cffi @ git+https://github.com/python-cffi/cffi.git@954cab4f889fb019a7f90df153ee1be501495f58" > cffi_constraint.txt
           PIP_CONSTRAINT=$PWD/cffi_constraint.txt pip install cffi
+      - name: Install Build Dependencies (%(future_python_version)s) - on Windows
+        if: >
+          matrix.python-version == '%(future_python_version)s'
+          && startsWith(runner.os, 'Windows')
+        run: |
+          # cffi will probably have no public release until a Python 3.13 beta
+          # or even RC release, see https://github.com/python-cffi/cffi/issues/23
+          echo "cffi @ git+https://github.com/python-cffi/cffi.git@954cab4f889fb019a7f90df153ee1be501495f58" > cffi_constraint.txt
+          set PIP_CONSTRAINT=%cd%\cffi_constraint.txt
+          pip install cffi
+          pip install -U pip
+          pip install -U setuptools wheel twine
 {% endif %}
       - name: Install Build Dependencies
 {% if with_future_python %}
@@ -162,8 +176,10 @@ jobs:
 {% endfor %}
 
 {% if with_future_python %}
-      - name: Install %(package_name)s and dependencies (%(future_python_version)s)
-        if: matrix.python-version == '%(future_python_version)s'
+      - name: Install %(package_name)s and dependencies (%(future_python_version)s) - no Windows
+        if: >
+          matrix.python-version == '%(future_python_version)s'
+          && !startsWith(runner.os, 'Windows')
         run: |
           # Install to collect dependencies into the (pip) cache.
           # cffi will probably have no public release until a Python 3.13 beta
@@ -172,6 +188,19 @@ jobs:
           # Use "--pre" here because dependencies with support for this future
           # Python release may only be available as pre-releases
           PIP_CONSTRAINT=$PWD/cffi_constraint.txt pip install --pre .[test]
+      - name: Install %(package_name)s and dependencies (%(future_python_version)s) - on Windows
+        if: >
+          matrix.python-version == '%(future_python_version)s'
+          && startsWith(runner.os, 'Windows')
+        run: |
+          # Install to collect dependencies into the (pip) cache.
+          # cffi will probably have no public release until a Python 3.13 beta
+          # or even RC release, see https://github.com/python-cffi/cffi/issues/23
+          echo "cffi @ git+https://github.com/python-cffi/cffi.git@954cab4f889fb019a7f90df153ee1be501495f58" > cffi_constraint.txt
+          # Use "--pre" here because dependencies with support for this future
+          # Python release may only be available as pre-releases
+          set PIP_CONSTRAINT=%cd%\cffi_constraint.txt
+          pip install --pre .[test]
 {% endif %}
       - name: Install %(package_name)s and dependencies
 {% if with_future_python %}
@@ -254,8 +283,10 @@ jobs:
   {% endfor %}
 {% else %}
 {% if with_future_python %}
-      - name: Install %(package_name)s %(future_python_version)s
-        if: ${{ startsWith(matrix.python-version, '%(future_python_version)s') }}
+      - name: Install %(package_name)s %(future_python_version)s ${{ matrix.python-version }}- no Windows
+        if: >
+          matrix.python-version == '%(future_python_version)s'
+          && !startsWith(runner.os, 'Windows')
         run: |
           pip install -U wheel setuptools
           # cffi will probably have no public release until a beta or even RC
@@ -271,6 +302,26 @@ jobs:
           # Use "--pre" here because dependencies with support for this future
           # Python release may only be available as pre-releases
           PIP_CONSTRAINT=$PWD/cffi_constraint.txt pip install --pre -U -e .[test]
+      - name: Install %(package_name)s %(future_python_version)s - on Windows
+        if: >
+          matrix.python-version == '%(future_python_version)s'
+          && startsWith(runner.os, 'Windows')
+        run: |
+          pip install -U wheel setuptools
+          # cffi will probably have no public release until a beta or even RC
+          # version of Python 3.13, see https://github.com/python-cffi/cffi/issues/23
+          echo 'cffi @ git+https://github.com/python-cffi/cffi.git@954cab4f889fb019a7f90df153ee1be501495f58 ; platform_python_implementation == "CPython"' > cffi_constraint.txt
+          # coverage has a wheel on PyPI for a future python version which is
+          # not ABI compatible with the current one, so build it from sdist:
+          pip install -U --no-binary :all: coverage
+          # Unzip into src/ so that testrunner can find the .so files
+          # when we ask it to load tests from that directory. This
+          # might also save some build time?
+          unzip -n dist/%(package_name)s-*whl -d src
+          # Use "--pre" here because dependencies with support for this future
+          # Python release may only be available as pre-releases
+          set PIP_CONSTRAINT=%cd%\cffi_constraint.txt
+          pip install --pre -U -e .[test]
 {% endif %}
       - name: Install %(package_name)s
 {% if with_future_python %}
@@ -299,12 +350,14 @@ jobs:
         run:
         {% if gha_test_commands %}
         {% for line in gha_test_commands %}
-          PURE_PYTHON=1 %(line)s
+          %(line)s
         {% endfor %}
         {% else %}
           # coverage makes PyPy run about 3x slower!
-          PURE_PYTHON=1 python -m coverage run -p -m zope.testrunner --test-path=src --auto-color --auto-progress
+          python -m coverage run -p -m zope.testrunner --test-path=src --auto-color --auto-progress
         {% endif %}
+        env:
+          PURE_PYTHON: 1
       - name: Report Coverage
         run: |
           coverage combine
@@ -423,7 +476,7 @@ jobs:
           path: wheelhouse/*whl
           name: manylinux_${{ matrix.image }}_wheels.zip
       - name: Restore pip cache permissions
-        run: sudo chown -R $(whoami) ${{ steps.pip-cache.outputs.dir }}
+        run: sudo chown -R $(whoami) ${{ steps.pip-cache-default.outputs.dir }}
       - name: Publish package to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
         if: >
diff --git a/config/config-package.py b/config/config-package.py
index e28ebaa..3251e97 100755
--- a/config/config-package.py
+++ b/config/config-package.py
@@ -68,13 +68,6 @@ def handle_command_line_arguments():
         action='store_false',
         default=True,
         help='Do not include flake8 and isort in the linting configuration.')
-    parser.add_argument(
-        '--with-appveyor',
-        dest='with_appveyor',
-        action='store_true',
-        default=False,
-        help='Activate running tests on AppVeyor, too, '
-        'if not already configured in .meta.toml.')
     parser.add_argument(
         '--with-macos',
         dest='with_macos',
@@ -185,10 +178,6 @@ def _read_meta_configuration(self):
             if self.args.with_docs is None:
                 self.args.with_docs = (self.path / "docs" / "conf.py").exists()
                 print(f"Autodetecting --with-docs: {self.args.with_docs}")
-            if self.args.with_appveyor is None:
-                value = (self.path / "appveyor.yml").exists()
-                self.args.with_appveyor = value
-                print(f"Autodetecting --with-appveyor: {value}")
         return meta_cfg
 
     @cached_property
@@ -220,10 +209,6 @@ def jinja_env(self):
             lstrip_blocks=True,
         )
 
-    @cached_property
-    def with_appveyor(self):
-        return self._set_python_config_value('appveyor')
-
     @cached_property
     def with_macos(self):
         return self._set_python_config_value('macos')
@@ -530,38 +515,7 @@ def manifest_in(self):
             self.copy_with_meta(
                 'MANIFEST.in.j2', self.path / 'MANIFEST.in', self.config_type,
                 additional_rules=additional_manifest_rules,
-                with_docs=self.with_docs, with_appveyor=self.with_appveyor)
-
-    def appveyor(self):
-        appveyor_global_env_vars = self.meta_cfg['appveyor'].get(
-            'global-env-vars', [])
-        appveyor_additional_matrix = self.meta_cfg['appveyor'].get(
-            'additional-matrix', [])
-        appveyor_install_steps = self.meta_cfg['appveyor'].get(
-            'install-steps', ['- pip install -U -e .[test]'])
-        appveyor_build_script = self.meta_cfg['appveyor'].get(
-            'build-script', [])
-        if self.config_type == 'c-code' and not appveyor_build_script:
-            appveyor_build_script = [
-                '- python -W ignore setup.py -q bdist_wheel']
-        appveyor_test_steps = self.meta_cfg['appveyor'].get(
-            'test-steps', ['- zope-testrunner --test-path=src'])
-        appveyor_additional_lines = self.meta_cfg['appveyor'].get(
-            'additional-lines', [])
-        appveyor_replacement = self.meta_cfg['appveyor'].get('replacement', [])
-        self.copy_with_meta(
-            'appveyor.yml.j2',
-            self.path / 'appveyor.yml',
-            self.config_type,
-            with_future_python=self.with_future_python,
-            global_env_vars=appveyor_global_env_vars,
-            additional_matrix=appveyor_additional_matrix,
-            install_steps=appveyor_install_steps,
-            test_steps=appveyor_test_steps,
-            build_script=appveyor_build_script,
-            additional_lines=appveyor_additional_lines,
-            replacement=appveyor_replacement,
-        )
+                with_docs=self.with_docs)
 
     def copy_with_meta(
             self, template_name, destination, config_type,
@@ -613,9 +567,6 @@ def configure(self):
         self.tests_yml()
         self.manifest_in()
 
-        if self.with_appveyor:
-            self.appveyor()
-
         with change_dir(self.path) as cwd:
             if pathlib.Path('bootstrap.py').exists():
                 call('git', 'rm', 'bootstrap.py')
@@ -625,8 +576,8 @@ def configure(self):
                 call('git', 'rm', '.coveragerc')
             if self.add_coveragerc and self.args.commit:
                 call('git', 'add', '.coveragerc')
-            if self.with_appveyor and self.args.commit:
-                call('git', 'add', 'appveyor.yml')
+            if pathlib.Path('appveyor.yml').exists():
+                call('git', 'rm', 'appveyor.yml')
             if self.with_docs and self.args.commit:
                 call('git', 'add', '.readthedocs.yaml')
             if self.add_manylinux and self.args.commit:
diff --git a/config/default/MANIFEST.in.j2 b/config/default/MANIFEST.in.j2
index 130577d..69c679a 100644
--- a/config/default/MANIFEST.in.j2
+++ b/config/default/MANIFEST.in.j2
@@ -3,9 +3,6 @@ include *.rst
 include *.txt
 include buildout.cfg
 include tox.ini
-{% if with_appveyor %}
-include appveyor.yml
-{% endif %}
 {% if config_type in ('buildout-recipe', 'c-code') %}
 include .coveragerc
 {% endif %}
diff --git a/config/default/appveyor.yml.j2 b/config/default/appveyor.yml.j2
deleted file mode 100644
index f6db6a6..0000000
--- a/config/default/appveyor.yml.j2
+++ /dev/null
@@ -1,64 +0,0 @@
-{% if replacement %}
-{% for line in replacement %}
-%(line)s
-{% endfor %}
-{% else %}
-environment:
-{% for line in global_env_vars %}
-  %(line)s
-{% endfor %}
-
-  matrix:
-    - python: 37-x64
-    - python: 38-x64
-    - python: 39-x64
-    - python: 310-x64
-    - python: 311-x64
-    - python: 312-x64
-{% if with_future_python %}
-    # `multibuild` cannot install non-final versions as they are not on
-    # ftp.python.org, so we skip Python 3.13 until its final release:
-    # - python: 313-x64
-{% endif %}
-{% for line in additional_matrix %}
-    %(line)s
-{% endfor %}
-
-install:
-  - "SET PYTHONVERSION=%PYTHON%"
-  - "SET PATH=C:\\Python%PYTHON%;c:\\Python%PYTHON%\\scripts;%PATH%"
-  - ps: |
-      $env:PYTHON = "C:\\Python${env:PYTHON}"
-      if (-not (Test-Path $env:PYTHON)) {
-        curl -o install_python.ps1 https://raw.githubusercontent.com/matthew-brett/multibuild/11a389d78892cf90addac8f69433d5e22bfa422a/install_python.ps1
-        .\install_python.ps1
-      }
-  - ps: if (-not (Test-Path $env:PYTHON)) { throw "No $env:PYTHON" }
-  - echo "C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /x64 > "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin\amd64\vcvars64.bat"
-  - python -m pip install -U pip
-  - pip install -U setuptools wheel
-{% for line in install_steps %}
-  %(line)s
-{% endfor %}
-
-matrix:
-  fast_finish: true
-
-{% if build_script %}
-build_script:
-  {% for line in build_script %}
-  %(line)s
-  {% endfor %}
-{% else %}
-build: false
-{% endif %}
-
-test_script:
-{% for line in test_steps %}
-  %(line)s
-{% endfor %}
-{% include 'appveyor-publish.j2' %}
-{% for line in additional_lines %}
-%(line)s
-{% endfor %}
-{% endif %}