diff --git a/CONSTRUCT.md b/CONSTRUCT.md
index 935061b8c..2397f181e 100644
--- a/CONSTRUCT.md
+++ b/CONSTRUCT.md
@@ -744,6 +744,7 @@ The output filename will be:
 - `win`
 - `win32`
 - `win64`
+- `win_arm64`
 - `x86`
 - `x86_64`
 
@@ -755,5 +756,6 @@ If provided, this argument must be formated as `<platform>-<architecture>`, e.g.
 - `linux-ppc64le`
 - `linux-s390x`
 - `win-64`
+- `win-arm64`
 - `osx-64`
 - `osx-arm64`
\ No newline at end of file
diff --git a/constructor/conda_interface.py b/constructor/conda_interface.py
index d40813165..ab1c46bf7 100644
--- a/constructor/conda_interface.py
+++ b/constructor/conda_interface.py
@@ -32,6 +32,7 @@
     "linux-ppc64le",
     "linux-s390x",
     "win-64",
+    "win-arm64",
     "osx-64",
     "osx-arm64",
 ]
diff --git a/constructor/construct.py b/constructor/construct.py
index bca76e357..bfd3fd8e6 100644
--- a/constructor/construct.py
+++ b/constructor/construct.py
@@ -52,6 +52,7 @@ def ns_platform(platform):
         win=p.startswith("win-"),
         win32=bool(p == "win-32"),
         win64=bool(p == "win-64"),
+        win_arm64=bool(p == "win-arm64"),
     )
 
 
diff --git a/constructor/nsis/main.nsi.tmpl b/constructor/nsis/main.nsi.tmpl
index c9fa01517..e214fbbd6 100644
--- a/constructor/nsis/main.nsi.tmpl
+++ b/constructor/nsis/main.nsi.tmpl
@@ -658,12 +658,23 @@ Function .onInit
     # on whether it's a 32-bit or 64-bit installer
     SetRegView {{ BITS }}
 {%- if win64 %}
-    # If we're a 64-bit installer, make sure it's 64-bit Windows
-    ${IfNot} ${RunningX64}
+    # Make sure we're not on 32-bit or native ARM64 Windows (the latter would
+    # otherwise silently run this x64 installer under x64 emulation).
+    ${IfNot} ${IsNativeAMD64}
         MessageBox MB_OK|MB_ICONEXCLAMATION \
-            "This installer is for a 64-bit version for ${NAME}$\n\
-            but your system is 32-bit. Please use the 32-bit Windows$\n\
-            ${NAME} installer." \
+            "This installer is for the 64-bit (x86_64) version of ${NAME}$\n\
+            but your system is not x86_64. Please use the installer that$\n\
+            matches your system's architecture." \
+            /SD IDOK
+        Abort
+    ${EndIf}
+{%- elif win_arm64 %}
+    # Make sure we're actually on native ARM64 Windows.
+    ${IfNot} ${IsNativeARM64}
+        MessageBox MB_OK|MB_ICONEXCLAMATION \
+            "This installer is for the ARM64 version of ${NAME}$\n\
+            but your system is not ARM64. Please use the installer that$\n\
+            matches your system's architecture." \
             /SD IDOK
         Abort
     ${EndIf}
diff --git a/constructor/winexe.py b/constructor/winexe.py
index ce6074971..cff693e72 100644
--- a/constructor/winexe.py
+++ b/constructor/winexe.py
@@ -44,6 +44,15 @@
 logger = logging.getLogger(__name__)
 
 
+def parse_arch(platform: str) -> tuple[str, int]:
+    """Return a tuple (display string, bit width) for a Windows platform string."""
+    arch = platform.split("-")[1]
+    if arch == "arm64":
+        return "ARM64", 64
+    bits = int(arch)
+    return "%d-bit" % bits, bits
+
+
 def read_nsi_tmpl(info) -> str:
     path = abspath(info.get("nsis_template", join(NSIS_DIR, "main.nsi.tmpl")))
     logger.info("Reading: %s", path)
@@ -155,7 +164,7 @@ def make_nsi(
         dists += env_info["_dists"]
     dists = list({dist: None for dist in dists})  # de-duplicate
 
-    arch = int(info["_platform"].split("-")[1])
+    display_arch, arch = parse_arch(info["_platform"])
     info["pre_install_desc"] = info.get("pre_install_desc", "")
     info["post_install_desc"] = info.get("post_install_desc", "")
 
@@ -164,7 +173,7 @@ def make_nsi(
         "installer_version": info["version"],
         "company": info.get("company", "Unknown, Inc."),
         "installer_platform": info["_platform"],
-        "arch": "%d-bit" % arch,
+        "arch": display_arch,
         "default_prefix": info.get("default_prefix", join("%USERPROFILE%", name.lower())),
         "default_prefix_domain_user": info.get(
             "default_prefix_domain_user", join("%LOCALAPPDATA%", name.lower())
@@ -413,17 +422,3 @@ def create(info, verbose=False):
 
     if not info.get("_debug"):
         shutil.rmtree(tmp_dir)
-
-
-if __name__ == "__main__":
-    make_nsi(
-        {
-            "name": "Maxi",
-            "version": "1.2",
-            "_platform": "win-64",
-            "_outpath": "dummy.exe",
-            "_download_dir": "dummy",
-            "_dists": ["python-2.7.9-0.tar.bz2", "vs2008_runtime-1.0-1.tar.bz2"],
-        },
-        ".",
-    )
diff --git a/docs/source/construct-yaml.md b/docs/source/construct-yaml.md
index 935061b8c..2397f181e 100644
--- a/docs/source/construct-yaml.md
+++ b/docs/source/construct-yaml.md
@@ -744,6 +744,7 @@ The output filename will be:
 - `win`
 - `win32`
 - `win64`
+- `win_arm64`
 - `x86`
 - `x86_64`
 
@@ -755,5 +756,6 @@ If provided, this argument must be formated as `<platform>-<architecture>`, e.g.
 - `linux-ppc64le`
 - `linux-s390x`
 - `win-64`
+- `win-arm64`
 - `osx-64`
 - `osx-arm64`
\ No newline at end of file
diff --git a/news/1323-extend-windows-support b/news/1323-extend-windows-support
new file mode 100644
index 000000000..1cacd6e8f
--- /dev/null
+++ b/news/1323-extend-windows-support
@@ -0,0 +1,19 @@
+### Enhancements
+
+* Add support for Windows ARM64. (#1323)
+
+### Bug fixes
+
+* <news item>
+
+### Deprecations
+
+* <news item>
+
+### Docs
+
+* <news item>
+
+### Other
+
+* <news item>
diff --git a/tests/test_construct.py b/tests/test_construct.py
index 6d3274c16..af4032c7a 100644
--- a/tests/test_construct.py
+++ b/tests/test_construct.py
@@ -4,7 +4,8 @@
 
 import pytest
 
-from constructor.conda_interface import cc_platform
+from constructor.conda_interface import SUPPORTED_PLATFORMS, cc_platform
+from constructor.construct import ns_platform
 from constructor.construct import parse as construct_parse
 from constructor.construct import render as construct_render
 
@@ -110,3 +111,24 @@ def test_parse_error(tmp_path):
         construct_parse(construct_yaml_file, cc_platform)
     assert exc.value.code != 0
     assert "Unable to parse" in str(exc.getrepr())
+
+
+NS_PLATFORM_TRUE_FLAGS = {
+    "linux-64": {"linux", "linux64", "x86", "x86_64", "unix"},
+    "linux-aarch64": {"linux", "aarch64", "unix"},
+    "linux-ppc64le": {"linux", "ppc64le", "unix"},
+    "linux-s390x": {"linux", "s390x", "unix"},
+    "win-64": {"x86", "x86_64", "win", "win64"},
+    "win-arm64": {"win", "win_arm64"},
+    "osx-64": {"x86", "x86_64", "osx", "unix"},
+    "osx-arm64": {"arm64", "osx", "unix"},
+}
+
+
+@pytest.mark.parametrize("platform", SUPPORTED_PLATFORMS)
+def test_ns_platform(platform):
+    result = ns_platform(platform)
+    assert result
+    true_flags = NS_PLATFORM_TRUE_FLAGS[platform]
+    for flag, value in result.items():
+        assert value is (flag in true_flags), f"{platform}: expected {flag}={flag in true_flags}"
diff --git a/tests/test_winexe.py b/tests/test_winexe.py
new file mode 100644
index 000000000..7982d5618
--- /dev/null
+++ b/tests/test_winexe.py
@@ -0,0 +1,21 @@
+import sys
+
+import pytest
+
+# winexe.py needs Pillow, which isn't installed on Linux. Skip this file there
+# and only import winexe inside each test, so collection doesn't fail.
+pytestmark = pytest.mark.skipif(sys.platform != "win32", reason="winexe is Windows-only")
+
+
+@pytest.mark.parametrize(
+    "platform,expected",
+    [
+        ("win-32", ("32-bit", 32)),
+        ("win-64", ("64-bit", 64)),
+        ("win-arm64", ("ARM64", 64)),
+    ],
+)
+def test_parse_arch(platform, expected):
+    from constructor.winexe import parse_arch
+
+    assert parse_arch(platform) == expected