diff --git a/.build.yml b/.build.yml
index 6aeec50..6144d65 100644
--- a/.build.yml
+++ b/.build.yml
@@ -5,6 +5,7 @@ packages:
   - qemu-user-static
   - binfmt-support
   - moreutils
+  - wine64
 sources:
   - https://git.sr.ht/~motiejus/bazel-zig-cc
 environment:
diff --git a/README.md b/README.md
index 552a0f5..a709204 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ http_archive(
     name = "bazel-zig-cc",
     sha256 = "cd2629843fe4ba20cf29e1d73cc02559afba640f884e519b6a194a35627cbbf3",
     strip_prefix = "bazel-zig-cc-{}".format(BAZEL_ZIG_CC_VERSION),
-    urls = ["https://git.sr.ht/~motiejus/bazel-zig-cc/archive/{}.tar.gz".format(BAZEL_ZIG_CC_VERSION)],
+    urls = ["https://git.sr.ht/~motiejus/bazel-zig-cc/archive/{}.{_ext}".format(BAZEL_ZIG_CC_VERSION)],
 )
 
 load("@bazel-zig-cc//toolchain:defs.bzl", zig_toolchains = "toolchains")
@@ -40,7 +40,7 @@ load("@bazel-zig-cc//toolchain:defs.bzl", zig_toolchains = "toolchains")
 zig_toolchains(
     version = "<...>",
     url_formats = [
-        "https://example.org/zig/zig-{host_platform}-{version}.tar.xz",
+        "https://example.org/zig/zig-{host_platform}-{version}.{_ext}",
     ],
     host_platform_sha256 = { ... },
 )
@@ -152,6 +152,8 @@ register_toolchains(
     "@zig_sdk//toolchain:linux_arm64_gnu.2.28",
     "@zig_sdk//toolchain:darwin_amd64",
     "@zig_sdk//toolchain:darwin_arm64",
+    "@zig_sdk//toolchain:windows_amd64",
+    "@zig_sdk//toolchain:windows_arm64",
 )
 ```
 
@@ -318,6 +320,17 @@ is currently not implemented.
 target macos.10 (Catalina), macos.11 (Big Sur) or macos.12 (Monterey). It
 currently targets the lowest version, without ability to change it.
 
+## Windows only: output file extensions
+
+For Windows targets Bazel uses Unix extensions for output binaries. Those may
+need to be renamed before deploying to the Windows system. Here is a primer:
+
+| Binary type    | Bazel extension | Windows extension |
+|----------------|-----------------|-------------------|
+| Static library | .a              | .lib              |
+| Shared library | .so             | .dll              |
+| Executable     | (no extension)  | .exe              |
+
 # Known Issues In Upstream
 
 This section lists issues that I've stumbled into when using `zig cc`, and is
@@ -384,10 +397,12 @@ This repository is used on the following (host) platforms:
 - `linux_arm64`, a.k.a. `AArch64`.
 - `darwin_amd64`, the 64-bit post-PowerPC models.
 - `darwin_arm64`, the M1.
+- `windows_amd64`, a.k.a. `x64`.
 
 The tests are running (CId) on linux-amd64, and are assuming the kernel is
-configured to run arm64 binaries. There are two reasonably convenient ways to
-configure arm64 emulation:
+configured to run `linux_arm64` and `windows_amd64` binaries.
+
+There are two reasonably convenient ways to configure `linux_arm64` emulation:
 
 1. Install and configure [`binfmt_misc`][binfmt_misc]:
    ```
@@ -399,6 +414,11 @@ configure arm64 emulation:
    docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
    ```
 
+In order to install and configure `windows_amd64` emulation:
+```
+apt install wine-binfmt
+```
+
 ## Transient docker environment
 
 A standalone Docker environment to play with bazel-zig-cc:
diff --git a/WORKSPACE b/WORKSPACE
index 214b203..b01b785 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -51,11 +51,13 @@ zig_toolchains()
 
 register_toolchains(
     # if no `--platform` is specified, these toolchains will be used for
-    # (linux,darwin)x(amd64,arm64)
+    # (linux,darwin,windows)x(amd64,arm64)
     "@zig_sdk//toolchain:linux_amd64_gnu.2.19",
     "@zig_sdk//toolchain:linux_arm64_gnu.2.28",
     "@zig_sdk//toolchain:darwin_amd64",
     "@zig_sdk//toolchain:darwin_arm64",
+    "@zig_sdk//toolchain:windows_amd64",
+    "@zig_sdk//toolchain:windows_arm64",
 
     # amd64 toolchains for libc-aware platforms:
     "@zig_sdk//libc_aware/toolchain:linux_amd64_gnu.2.19",
diff --git a/ci/test b/ci/test
index debdc0b..269510d 100755
--- a/ci/test
+++ b/ci/test
@@ -1,3 +1,4 @@
-#!/bin/sh
+#!/bin/bash
+set -xeuo pipefail
 
-exec bazel test ...
+bazel test ...
diff --git a/relnotes.awk b/relnotes.awk
index 3ac8a2f..a24720a 100755
--- a/relnotes.awk
+++ b/relnotes.awk
@@ -14,7 +14,7 @@ BEGIN {stage=0};
     print "    name = \"bazel-zig-cc\","
     print "    sha256 = \""sha256sum"\","
     print "    strip_prefix = \"bazel-zig-cc-{}\".format(BAZEL_ZIG_CC_VERSION),"
-    print "    urls = [\"https://git.sr.ht/~motiejus/bazel-zig-cc/archive/{}.tar.gz\".format(BAZEL_ZIG_CC_VERSION)],"
+    print "    urls = [\"https://git.sr.ht/~motiejus/bazel-zig-cc/archive/{}.{_ext}\".format(BAZEL_ZIG_CC_VERSION)],"
     print ")"
     stage=1
     next
diff --git a/rules/platform.bzl b/rules/platform.bzl
index aabb328..d179cc4 100644
--- a/rules/platform.bzl
+++ b/rules/platform.bzl
@@ -1,3 +1,10 @@
+def _vars_script(env, run_under, cmd):
+    ret = ["#!/bin/sh"]
+    for k, v in env.items():
+        ret += ['export {}="{}"'.format(k, v)]
+    ret += ['exec {} {} "$@"'.format(run_under, cmd)]
+    return "\n".join(ret) + "\n"  # trailing newline is easier on the eyes
+
 def _platform_transition_impl(settings, attr):
     _ignore = settings
     return {
@@ -17,16 +24,18 @@ def _platform_binary_impl(ctx):
 
     executable = None
     if source_info.files_to_run and source_info.files_to_run.executable:
+        command = _vars_script(ctx.attr.env, ctx.attr.run_under, source_info.files_to_run.executable.short_path)
         executable = ctx.actions.declare_file("{}_{}".format(ctx.file.src.basename, ctx.attr.platform))
-        ctx.actions.run_shell(
-            command = "cp {} {}".format(source_info.files_to_run.executable.path, executable.path),
-            inputs = [source_info.files_to_run.executable],
-            outputs = [executable],
+        ctx.actions.write(
+            output = executable,
+            content = command,
+            is_executable = True,
         )
 
     return [DefaultInfo(
-        files = depset(ctx.files.src),
         executable = executable,
+        files = depset([executable]),
+        runfiles = ctx.runfiles(files = ctx.files.src),
     )]
 
 _attrs = {
@@ -38,6 +47,12 @@ _attrs = {
     "platform": attr.string(
         doc = "The platform to build the target for.",
     ),
+    "run_under": attr.string(
+        doc = "wrapper executable",
+    ),
+    "env": attr.string_dict(
+        doc = "Environment variables for the test",
+    ),
     "_allowlist_function_transition": attr.label(
         default = "@bazel_tools//tools/allowlists/function_transition_allowlist",
     ),
diff --git a/test/c/BUILD b/test/c/BUILD
index 99e36c4..c5e6748 100644
--- a/test/c/BUILD
+++ b/test/c/BUILD
@@ -13,7 +13,9 @@ cc_binary(
         platform_binary(
             name = "which_libc_{}".format(name),
             src = "which_libc",
+            env = {"QEMU_LD_PREFIX": "/usr/aarch64-linux-gnu"} if is_arm64 else {},
             platform = platform,
+            run_under = "qemu-aarch64-static" if is_arm64 else "",
         ),
         sh_test(
             name = "test_libc_{}".format(name),
@@ -25,12 +27,12 @@ cc_binary(
             },
         ),
     )
-    for name, platform, want in [
-        ("linux_amd64_musl", "//libc_aware/platform:linux_amd64_musl", "non-glibc"),
-        ("linux_amd64_gnu.2.19", "//libc_aware/platform:linux_amd64_gnu.2.19", "glibc_2.19"),
-        ("linux_amd64_gnu.2.28", "//libc_aware/platform:linux_amd64_gnu.2.28", "glibc_2.28"),
-        ("linux_amd64_gnu.2.31", "//libc_aware/platform:linux_amd64_gnu.2.31", "glibc_2.31"),
-        ("linux_amd64", "//platform:linux_amd64", "glibc_2.19"),
-        ("linux_arm64", "//platform:linux_arm64", "glibc_2.28"),
+    for name, platform, want, is_arm64 in [
+        ("linux_amd64_musl", "//libc_aware/platform:linux_amd64_musl", "non-glibc", False),
+        ("linux_amd64_gnu.2.19", "//libc_aware/platform:linux_amd64_gnu.2.19", "glibc_2.19", False),
+        ("linux_amd64_gnu.2.28", "//libc_aware/platform:linux_amd64_gnu.2.28", "glibc_2.28", False),
+        ("linux_amd64_gnu.2.31", "//libc_aware/platform:linux_amd64_gnu.2.31", "glibc_2.31", False),
+        ("linux_amd64", "//platform:linux_amd64", "glibc_2.19", False),
+        ("linux_arm64", "//platform:linux_arm64", "glibc_2.28", True),
     ]
 ]
diff --git a/test/c/test.sh b/test/c/test.sh
index d5331ff..ee67dd3 100755
--- a/test/c/test.sh
+++ b/test/c/test.sh
@@ -1,10 +1,11 @@
-#/bin/bash
+#!/bin/bash
 
 set -euo pipefail
 
+# shellcheck disable=SC2153
 want=$WANT
+# shellcheck disable=SC2153
 binary=$BINARY
-
 got=$($binary)
 
 if [[ "$got" != "$want" ]]; then
diff --git a/test/cgo/BUILD b/test/cgo/BUILD
index 1e11a22..a65c350 100644
--- a/test/cgo/BUILD
+++ b/test/cgo/BUILD
@@ -41,12 +41,14 @@ go_binary(
     platform_test(
         name = "cgo_test_{}".format(name),
         src = "cgo_test",
+        env = {"QEMU_LD_PREFIX": "/usr/aarch64-linux-gnu"} if is_arm64 else {},
         platform = platform,
+        run_under = "qemu-aarch64-static" if is_arm64 else "",
     )
-    for name, platform in [
-        ("linux_amd64_musl", "//libc_aware/platform:linux_amd64_musl"),
-        ("linux_amd64_gnu.2.19", "//libc_aware/platform:linux_amd64_gnu.2.19"),
-        ("linux_arm64_musl", "//libc_aware/platform:linux_arm64_musl"),
-        ("linux_arm64_gnu.2.28", "//libc_aware/platform:linux_arm64_gnu.2.28"),
+    for name, platform, is_arm64 in [
+        ("linux_amd64_musl", "//libc_aware/platform:linux_amd64_musl", False),
+        ("linux_amd64_gnu.2.19", "//libc_aware/platform:linux_amd64_gnu.2.19", False),
+        ("linux_arm64_musl", "//libc_aware/platform:linux_arm64_musl", True),
+        ("linux_arm64_gnu.2.28", "//libc_aware/platform:linux_arm64_gnu.2.28", True),
     ]
 ]
diff --git a/test/windows/BUILD b/test/windows/BUILD
new file mode 100644
index 0000000..cb8d17a
--- /dev/null
+++ b/test/windows/BUILD
@@ -0,0 +1,21 @@
+load("@bazel-zig-cc//rules:platform.bzl", "platform_binary", "platform_test")
+
+cc_binary(
+    name = "winver",
+    srcs = ["main.c"],
+    tags = ["manual"],
+)
+
+platform_test(
+    name = "winver_windows_amd64",
+    src = "winver",
+    platform = "//platform:windows_amd64",
+    run_under = "wine64-stable",
+    tags = ["no-sandbox"],
+)
+
+platform_binary(
+    name = "winver_windows_arm64",
+    src = "winver",
+    platform = "//platform:windows_arm64",
+)
diff --git a/test/windows/main.c b/test/windows/main.c
new file mode 100644
index 0000000..b5302af
--- /dev/null
+++ b/test/windows/main.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <windows.h>
+
+int main() {
+    DWORD version = GetVersion();
+    DWORD majorVersion = (DWORD)(LOBYTE(LOWORD(version)));
+    DWORD minorVersion = (DWORD)(HIBYTE(LOWORD(version)));
+
+    DWORD build = 0;
+    if (version < 0x80000000) {
+        build = (DWORD)(HIWORD(version));
+    }
+
+    printf("Running Windows version %d.%d (%d).\n", majorVersion, minorVersion, build);
+    return 0;
+}
diff --git a/toolchain/BUILD.sdk.bazel b/toolchain/BUILD.sdk.bazel
index ada3e5d..e1505b1 100644
--- a/toolchain/BUILD.sdk.bazel
+++ b/toolchain/BUILD.sdk.bazel
@@ -7,6 +7,7 @@ package(
 
 
 declare_files(
+    os = {os},
     zig_include_root = {zig_include_root},
 )
 
diff --git a/toolchain/defs.bzl b/toolchain/defs.bzl
index 9ab4e88..e165a86 100644
--- a/toolchain/defs.bzl
+++ b/toolchain/defs.bzl
@@ -1,6 +1,6 @@
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 load("@bazel_tools//tools/build_defs/repo:utils.bzl", "read_user_netrc", "use_netrc")
-load("@bazel-zig-cc//toolchain/private:defs.bzl", "DEFAULT_INCLUDE_DIRECTORIES", "ZIG_TOOL_PATH", "target_structs")
+load("@bazel-zig-cc//toolchain/private:defs.bzl", "DEFAULT_INCLUDE_DIRECTORIES", "target_structs", "zig_tool_path")
 
 _fcntl_map = """
 GLIBC_2.2.5 {
@@ -16,21 +16,21 @@ __asm__(".symver fcntl64, fcntl@GLIBC_2.2.5");
 """
 
 # Official recommended version. Should use this when we have a usable release.
-URL_FORMAT_RELEASE = "https://ziglang.org/download/{version}/zig-{host_platform}-{version}.tar.xz"
+URL_FORMAT_RELEASE = "https://ziglang.org/download/{version}/zig-{host_platform}-{version}.{_ext}"
 
 # Caution: nightly releases are purged from ziglang.org after ~90 days. A real
 # solution would be to allow the downstream project specify their own mirrors.
 # This is explained in
 # https://sr.ht/~motiejus/bazel-zig-cc/#alternative-download-urls and is
 # awaiting my attention or your contribution.
-URL_FORMAT_NIGHTLY = "https://ziglang.org/builds/zig-{host_platform}-{version}.tar.xz"
+URL_FORMAT_NIGHTLY = "https://ziglang.org/builds/zig-{host_platform}-{version}.{_ext}"
 
 # Author's mirror that doesn't purge the nightlies so aggressively. I will be
 # cleaning those up manually only after the artifacts are not in use for many
 # months in bazel-zig-cc. dl.jakstys.lt is a small x86_64 server with an NVMe
 # drive sitting in my home closet on a 1GB/s symmetric residential connection,
 # which, as of writing, has been quite reliable.
-URL_FORMAT_JAKSTYS = "https://dl.jakstys.lt/zig/zig-{host_platform}-{version}.tar.xz"
+URL_FORMAT_JAKSTYS = "https://dl.jakstys.lt/zig/zig-{host_platform}-{version}.{_ext}"
 
 _VERSION = "0.10.0-dev.2252+a4369918b"
 
@@ -39,12 +39,22 @@ _HOST_PLATFORM_SHA256 = {
     "linux-x86_64": "1d3c3769eba85a4334c93a3cfa35ad0ef914dd8cf9fd502802004c6908f5370c",
     "macos-aarch64": "ab46e7499e5bd7b6d6ff2ac331e1a4aa875a01b270dc40306bc29dbaf216fccf",
     "macos-x86_64": "fb213f996bcab805839e401292c42a92b63cd97deb1631e31bd61f534b7f6b1c",
+    "windows-x86_64": "14e43a64026512161f3d6201d8972a28f0508da2782c16e980f2ffa3bb7e6720",
+}
+
+_HOST_PLATFORM_EXT = {
+    "linux-aarch64": "tar.xz",
+    "linux-x86_64": "tar.xz",
+    "macos-aarch64": "tar.xz",
+    "macos-x86_64": "tar.xz",
+    "windows-x86_64": "zip",
 }
 
 def toolchains(
         version = _VERSION,
         url_formats = [URL_FORMAT_NIGHTLY, URL_FORMAT_JAKSTYS],
-        host_platform_sha256 = _HOST_PLATFORM_SHA256):
+        host_platform_sha256 = _HOST_PLATFORM_SHA256,
+        host_platform_ext = _HOST_PLATFORM_EXT):
     """
         Download zig toolchain and declare bazel toolchains.
         The platforms are not registered automatically, that should be done by
@@ -56,11 +66,13 @@ def toolchains(
         version = version,
         url_formats = url_formats,
         host_platform_sha256 = host_platform_sha256,
+        host_platform_ext = host_platform_ext,
         host_platform_include_root = {
             "linux-aarch64": "lib/zig/",
             "linux-x86_64": "lib/",
             "macos-aarch64": "lib/zig/",
             "macos-x86_64": "lib/zig/",
+            "windows-x86_64": "lib/",
         },
     )
 
@@ -81,6 +93,10 @@ export ZIG_GLOBAL_CACHE_DIR=$ZIG_LOCAL_CACHE_DIR
 exec "{zig}" "{zig_tool}" "$@"
 """
 
+ZIG_TOOL_WRAPPER_WINDOWS = """@echo off
+"{zig}" "{zig_tool}" %*
+"""
+
 _ZIG_TOOLS = [
     "c++",
     "cc",
@@ -103,11 +119,16 @@ def _zig_repository_impl(repository_ctx):
     if os.startswith("mac os"):
         os = "macos"
 
+    if os.startswith("windows"):
+        os = "windows"
+
     host_platform = "{}-{}".format(os, arch)
 
     zig_include_root = repository_ctx.attr.host_platform_include_root[host_platform]
     zig_sha256 = repository_ctx.attr.host_platform_sha256[host_platform]
+    zig_ext = repository_ctx.attr.host_platform_ext[host_platform]
     format_vars = {
+        "_ext": zig_ext,
         "version": repository_ctx.attr.version,
         "host_platform": host_platform,
     }
@@ -121,12 +142,19 @@ def _zig_repository_impl(repository_ctx):
     )
 
     for zig_tool in _ZIG_TOOLS:
-        repository_ctx.file(
-            ZIG_TOOL_PATH.format(zig_tool = zig_tool),
-            ZIG_TOOL_WRAPPER.format(
-                zig = str(repository_ctx.path("zig")),
+        zig_tool_wrapper = ZIG_TOOL_WRAPPER.format(
+            zig = str(repository_ctx.path("zig")),
+            zig_tool = zig_tool,
+        )
+        if os == "windows":
+            zig_tool_wrapper = ZIG_TOOL_WRAPPER_WINDOWS.format(
+                zig = str(repository_ctx.path("zig")).replace("/", "\\") + ".exe",
                 zig_tool = zig_tool,
-            ),
+            )
+
+        repository_ctx.file(
+            zig_tool_path(os).format(zig_tool = zig_tool),
+            zig_tool_wrapper,
         )
 
     repository_ctx.file(
@@ -157,6 +185,7 @@ def _zig_repository_impl(repository_ctx):
             executable = False,
             substitutions = {
                 "{absolute_path}": _quote(str(repository_ctx.path(""))),
+                "{os}": _quote(os),
                 "{zig_include_root}": _quote(zig_include_root),
             },
         )
@@ -167,6 +196,7 @@ zig_repository = repository_rule(
         "host_platform_sha256": attr.string_dict(),
         "url_formats": attr.string_list(allow_empty = False),
         "host_platform_include_root": attr.string_dict(),
+        "host_platform_ext": attr.string_dict(),
     },
     implementation = _zig_repository_impl,
 )
@@ -175,9 +205,13 @@ def filegroup(name, **kwargs):
     native.filegroup(name = name, **kwargs)
     return ":" + name
 
-def declare_files(zig_include_root):
+def declare_files(os, zig_include_root):
     filegroup(name = "empty")
-    native.exports_files(["zig"], visibility = ["//visibility:public"])
+    if os == "windows":
+        native.exports_files(["zig.exe"], visibility = ["//visibility:public"])
+        native.alias(name = "zig", actual = ":zig.exe")
+    else:
+        native.exports_files(["zig"], visibility = ["//visibility:public"])
     filegroup(name = "lib/std", srcs = native.glob(["lib/std/**"]))
 
     lazy_filegroups = {}
diff --git a/toolchain/platform/defs.bzl b/toolchain/platform/defs.bzl
index cf42191..07e69a6 100644
--- a/toolchain/platform/defs.bzl
+++ b/toolchain/platform/defs.bzl
@@ -1,11 +1,16 @@
 load("@bazel-zig-cc//toolchain/private:defs.bzl", "LIBCS")
 
 _CPUS = (("x86_64", "amd64"), ("aarch64", "arm64"))
+_OS = {
+    "linux": ["linux"],
+    "macos": ["macos", "darwin"],
+    "windows": ["windows"],
+}
 
 def declare_platforms():
     # create @zig_sdk//{os}_{arch}_platform entries with zig and go conventions
     for zigcpu, gocpu in _CPUS:
-        for bzlos, oss in {"linux": ["linux"], "macos": ["macos", "darwin"]}.items():
+        for bzlos, oss in _OS.items():
             for os in oss:
                 declare_platform(gocpu, zigcpu, bzlos, os)
 
diff --git a/toolchain/private/BUILD.sdk.bazel b/toolchain/private/BUILD.sdk.bazel
index 39a6a93..3e7c23e 100644
--- a/toolchain/private/BUILD.sdk.bazel
+++ b/toolchain/private/BUILD.sdk.bazel
@@ -1,6 +1,7 @@
 load("@bazel-zig-cc//toolchain/private:cc_toolchains.bzl", "declare_cc_toolchains")
 
 declare_cc_toolchains(
+    os = {os},
     absolute_path = {absolute_path},
     zig_include_root = {zig_include_root},
 )
diff --git a/toolchain/private/cc_toolchains.bzl b/toolchain/private/cc_toolchains.bzl
index 3a1e1cb..724cbda 100644
--- a/toolchain/private/cc_toolchains.bzl
+++ b/toolchain/private/cc_toolchains.bzl
@@ -1,4 +1,4 @@
-load(":defs.bzl", "DEFAULT_INCLUDE_DIRECTORIES", "ZIG_TOOL_PATH", "target_structs")
+load(":defs.bzl", "DEFAULT_INCLUDE_DIRECTORIES", "target_structs", "zig_tool_path")
 load("@bazel-zig-cc//toolchain:zig_toolchain.bzl", "zig_cc_toolchain_config")
 
 DEFAULT_TOOL_PATHS = {
@@ -11,7 +11,7 @@ DEFAULT_TOOL_PATHS = {
     "strip": "/usr/bin/false",
 }.items()
 
-def declare_cc_toolchains(absolute_path, zig_include_root):
+def declare_cc_toolchains(os, absolute_path, zig_include_root):
     for target_config in target_structs():
         gotarget = target_config.gotarget
         zigtarget = target_config.zigtarget
@@ -28,7 +28,7 @@ def declare_cc_toolchains(absolute_path, zig_include_root):
             if path[0] == "/":
                 absolute_tool_paths[name] = path
                 continue
-            tool_path = ZIG_TOOL_PATH.format(zig_tool = path)
+            tool_path = zig_tool_path(os).format(zig_tool = path)
             absolute_tool_paths[name] = "%s/%s" % (absolute_path, tool_path)
 
         linkopts = target_config.linkopts
diff --git a/toolchain/private/defs.bzl b/toolchain/private/defs.bzl
index 42aaaeb..1aba438 100644
--- a/toolchain/private/defs.bzl
+++ b/toolchain/private/defs.bzl
@@ -4,7 +4,7 @@ DEFAULT_INCLUDE_DIRECTORIES = [
     "libcxxabi/include",
 ]
 
-ZIG_TOOL_PATH = "tools/{zig_tool}"
+_ZIG_TOOL_PATH = "tools/{zig_tool}"
 
 # Zig supports even older glibcs than defined below, but we have tested only
 # down to 2.17.
@@ -30,10 +30,17 @@ _GLIBCS = [
 
 LIBCS = ["musl"] + ["gnu.{}".format(glibc) for glibc in _GLIBCS]
 
+def zig_tool_path(os):
+    if os == "windows":
+        return _ZIG_TOOL_PATH + ".bat"
+    else:
+        return _ZIG_TOOL_PATH
+
 def target_structs():
     ret = []
     for zigcpu, gocpu in (("x86_64", "amd64"), ("aarch64", "arm64")):
         ret.append(_target_darwin(gocpu, zigcpu))
+        ret.append(_target_windows(gocpu, zigcpu))
         ret.append(_target_linux_musl(gocpu, zigcpu))
         for glibc in _GLIBCS:
             ret.append(_target_linux_gnu(gocpu, zigcpu, glibc))
@@ -64,6 +71,25 @@ def _target_darwin(gocpu, zigcpu):
         tool_paths = {"ld": "ld64.lld"},
     )
 
+def _target_windows(gocpu, zigcpu):
+    return struct(
+        gotarget = "windows_{}".format(gocpu),
+        zigtarget = "{}-windows-gnu".format(zigcpu),
+        includes = [
+            "libunwind/include",
+            "libc/include/any-windows-any",
+        ],
+        linkopts = [],
+        dynamic_library_linkopts = [],
+        copts = [],
+        bazel_target_cpu = "x64_windows",
+        constraint_values = [
+            "@platforms//os:windows",
+            "@platforms//cpu:{}".format(zigcpu),
+        ],
+        tool_paths = {"ld": "ld64.lld"},
+    )
+
 def _target_linux_gnu(gocpu, zigcpu, glibc_version):
     glibc_suffix = "gnu.{}".format(glibc_version)