diff --git a/setup/build.py b/setup/build.py
index b6e7aed512..44b5d9935a 100644
--- a/setup/build.py
+++ b/setup/build.py
@@ -312,13 +312,13 @@ def init_env(debug=False, sanitize=False, compiling_for='native'):
         if compiling_for == 'windows':
             cc = cxx = 'clang-cl'
             linker = 'lld-link'
-            splat = '.build-cache/xwin/splat'
+            splat = '.build-cache/xwin/root'
             cflags.append('-fcolor-diagnostics')
             cflags.append('-fansi-escape-codes')
             for I in 'sdk/include/um sdk/include/cppwinrt sdk/include/shared sdk/include/ucrt crt/include'.split():
                 cflags.append('/external:I')
                 cflags.append(f'{splat}/{I}')
-            for L in 'sdk/lib/um/x86_64 crt/lib/x86_64 sdk/lib/ucrt/x86_64'.split():
+            for L in 'sdk/lib/um crt/lib sdk/lib/ucrt'.split():
                 ldflags.append(f'/libpath:{splat}/{L}')
         else:
             for p in win_inc:
@@ -421,7 +421,7 @@ class Build(Command):
         self.compiling_for = 'native'
         if islinux and opts.cross_compile_extensions == 'windows':
             self.compiling_for = 'windows'
-            if not os.path.exists('.build-cache/xwin/splat'):
+            if not os.path.exists('.build-cache/xwin/root'):
                 subprocess.check_call([sys.executable, 'setup.py', 'xwin'])
         self.env = init_env(debug=opts.debug)
         self.windows_cross_env = init_env(debug=opts.debug, compiling_for='windows')
@@ -539,8 +539,6 @@ class Build(Command):
 
             if ext.needs_c_std and not env.std_prefix.startswith('/'):
                 cflags.append(env.std_prefix + 'c' + ext.needs_c_std)
-            if env is self.windows_cross_env:
-                cflags.append('-Wno-deprecated-experimental-coroutine')
 
             cmd = [compiler] + env.cflags + cflags + ext.cflags + einc + sinc + oinc
             return CompileCommand(cmd, src, obj)
diff --git a/setup/wincross.py b/setup/wincross.py
new file mode 100644
index 0000000000..f02502f26f
--- /dev/null
+++ b/setup/wincross.py
@@ -0,0 +1,444 @@
+#!/usr/bin/env python
+# License: GPLv3 Copyright: 2023, Kovid Goyal <kovid at kovidgoyal.net>
+
+import argparse
+import concurrent.futures
+import glob
+import hashlib
+import json
+import os
+import re
+import shutil
+import subprocess
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+from functools import partial
+from pprint import pprint
+from tempfile import TemporaryDirectory
+from urllib.parse import unquote
+from urllib.request import urlopen
+from zipfile import ZipFile
+
+
+@dataclass
+class File:
+    filename: str
+    url: str
+    size: int
+    sha256: str
+
+    def __init__(self, pf, filename=''):
+        self.filename=filename or pf['fileName']
+        self.url=pf['url']
+        self.size=pf['size']
+        self.sha256=pf['sha256'].lower()
+
+
+def package_sort_key(p):
+    chip = 0 if p.get('chip', '').lower() == 'x64' else 1
+    language = 0 if p.get('language', '').lower().startswith('en-') else 1
+    return chip, language
+
+
+def llvm_arch_to_ms_arch(arch):
+    return {'x86_64': 'x64', 'aarch64': 'arm64', 'x64': 'x64', 'arm64': 'arm64'}[arch]
+
+
+class Packages:
+
+    def __init__(self, manifest_raw, crt_variant, arch):
+        arch = llvm_arch_to_ms_arch(arch)
+        self.manifest = json.loads(manifest_raw)
+        self.packages = defaultdict(list)
+        self.cabinet_entries = {}
+        for p in self.manifest['packages']:
+            pid = p['id'].lower()
+            self.packages[pid].append(p)
+        for v in self.packages.values():
+            v.sort(key=package_sort_key)
+
+        build_tools = self.packages[
+            'Microsoft.VisualStudio.Product.BuildTools'.lower()][0]
+        pat = re.compile(r'Microsoft\.VisualStudio\.Component\.VC\.(.+)\.x86\.x64')
+        latest = (0, 0, 0, 0)
+        self.crt_version = ''
+        for dep in build_tools['dependencies']:
+            m = pat.match(dep)
+            if m is not None:
+                parts = m.group(1).split('.')
+                if len(parts) > 1:
+                    q = tuple(map(int, parts))
+                    if q > latest:
+                        self.crt_version = m.group(1)
+                        latest = q
+        if not self.crt_version:
+            raise KeyError('Failed to find CRT version from build tools deps')
+        self.files_to_download = []
+
+        def add_package(key):
+            p = self.packages.get(key.lower())
+            if not p:
+                raise KeyError(f'No package named {key} found')
+            for pf in p[0]['payloads']:
+                self.files_to_download.append(File(pf))
+
+        # CRT headers
+        add_package(f"Microsoft.VC.{self.crt_version}.CRT.Headers.base")
+        # CRT libs
+        prefix = f'Microsoft.VC.{self.crt_version}.CRT.{arch}.'.lower()
+        variants = {}
+        for pid in self.packages:
+            if pid.startswith(prefix):
+                parts = pid[len(prefix):].split('.')
+                if parts[-1] == 'base':
+                    variant = parts[0]
+                    if variant not in variants or 'spectre' in parts:
+                        # spectre variant contains both spectre and regular libs
+                        variants[variant] = pid
+        add_package(variants[crt_variant])
+        # ATL headers
+        add_package(f"Microsoft.VC.{self.crt_version}.ATL.Headers.base")
+        # ATL libs
+        add_package(f'Microsoft.VC.{self.crt_version}.ATL.{arch}.Spectre.base')
+        add_package(f'Microsoft.VC.{self.crt_version}.ATL.{arch}.base')
+        # WinSDK
+        pat = re.compile(r'Win(\d+)SDK_(\d.+)', re.IGNORECASE)
+        latest_sdk = (0, 0, 0)
+        self.sdk_version = ''
+        sdk_pid = ''
+        for pid in self.packages:
+            m = pat.match(pid)
+            if m is not None:
+                ver = tuple(map(int, m.group(2).split('.')))
+                if ver > latest_sdk:
+                    self.sdk_version = m.group(2)
+                    latest_sdk = ver
+                    sdk_pid = pid
+        if not self.sdk_version:
+            raise KeyError('Failed to find SDK package')
+        # headers are in x86 package and arch specific package
+        for pf in self.packages[sdk_pid][0]['payloads']:
+            fname = pf['fileName'].split('\\')[-1]
+            if fname.startswith('Windows SDK Desktop Headers '):
+                q = fname[len('Windows SDK Desktop Headers '):]
+                if q.lower() == 'x86-x86_en-us.msi':
+                    self.files_to_download.append(File(
+                        pf, filename=f'{sdk_pid}_headers.msi'))
+                elif q.lower() == f'{arch}-x86_en-us.msi':
+                    self.files_to_download.append(File(
+                        pf, filename=f'{sdk_pid}_{arch}_headers.msi'))
+            elif fname == 'Windows SDK for Windows Store Apps Headers-x86_en-us.msi':
+                self.files_to_download.append(File(
+                    pf, filename=f'{sdk_pid}_store_headers.msi'))
+            elif fname.startswith('Windows SDK Desktop Libs '):
+                q = fname[len('Windows SDK Desktop Libs '):]
+                if q == f'{arch}-x86_en-us.msi':
+                    self.files_to_download.append(File(
+                        pf, filename=f'{sdk_pid}_libs_x64.msi'))
+            elif fname == 'Windows SDK for Windows Store Apps Libs-x86_en-us.msi':
+                self.files_to_download.append(File(
+                    pf, filename=f'{sdk_pid}_store_libs.msi'))
+            elif (fl := fname.lower()).endswith('.cab'):
+                self.cabinet_entries[fl] = File(pf, filename=fl)
+        # UCRT
+        for pf in self.packages[
+                'Microsoft.Windows.UniversalCRT.HeadersLibsSources.Msi'.lower()][0]['payloads']:
+            fname = pf['fileName'].split('\\')[-1]
+            if fname == 'Universal CRT Headers Libraries and Sources-x86_en-us.msi':
+                self.files_to_download.append(File(pf))
+                self.files_to_download[-1].filename = 'ucrt.msi'
+            elif (fl := fname.lower()).endswith('.cab'):
+                self.cabinet_entries[fl] = File(pf, filename=fl)
+
+
+def download_item(dest_dir: str, file: File):
+    dest = os.path.join(dest_dir, file.filename)
+    m = hashlib.sha256()
+    with urlopen(file.url) as src, open(dest, 'wb') as d:
+        with memoryview(bytearray(shutil.COPY_BUFSIZE)) as buf:
+            while True:
+                n = src.readinto(buf)
+                if not n:
+                    break
+                elif n < shutil.COPY_BUFSIZE:
+                    with buf[:n] as smv:
+                        d.write(smv)
+                        m.update(smv)
+                else:
+                    d.write(buf)
+                    m.update(buf)
+    if m.hexdigest() != file.sha256:
+        raise SystemExit(f'The hash for {file.filename} does not match.'
+                         f' {m.hexdigest()} != {file.sha256}')
+
+def cabinets_in_msi(path):
+    raw = subprocess.check_output(['msiinfo', 'export', path, 'Media']).decode('utf-8')
+    return re.findall(r'\S+\.cab', raw)
+
+
+def download(dest_dir, manifest_version=17, manifest_type='release', manifest_path='', crt_variant='desktop', arch='x86_64'):
+    if manifest_path:
+        manifest = open(manifest_path, 'rb').read()
+    else:
+        url = f'https://aka.ms/vs/{manifest_version}/{manifest_type}/channel'
+        manifest = urlopen(url).read()
+    pkgs = Packages(manifest, crt_variant, arch)
+    os.makedirs(dest_dir, exist_ok=True)
+    total = sum(x.size for x in pkgs.files_to_download)
+    print('Downloading', int(total/(1024*1024)), 'MB in', len(pkgs.files_to_download),
+          'files...')
+    with concurrent.futures.ThreadPoolExecutor(max_workers=4) as executor:
+        for _ in executor.map(partial(download_item, dest_dir), pkgs.files_to_download):
+            pass
+    cabs = []
+    for x in os.listdir(dest_dir):
+        if x.lower().endswith('.msi'):
+            for cab in cabinets_in_msi(os.path.join(dest_dir, x)):
+                cabs.append(pkgs.cabinet_entries[cab])
+    total = sum(x.size for x in cabs)
+    print('Downloading', int(total/(1024*1024)), 'MB in', len(cabs), 'files...')
+    with concurrent.futures.ThreadPoolExecutor(max_workers=4) as executor:
+        for _ in executor.map(partial(download_item, dest_dir), cabs):
+            pass
+
+
+def merge_trees(src, dest):
+    if not os.path.isdir(src):
+        return
+    if not os.path.isdir(dest):
+        shutil.move(src, dest)
+        return
+    destnames = {n.lower():n for n in os.listdir(dest)}
+    for d in os.scandir(src):
+        n = d.name
+        srcname = os.path.join(src, n)
+        destname = os.path.join(dest, n)
+        if d.is_dir():
+            if os.path.isdir(destname):
+                merge_trees(srcname, destname)
+            elif n.lower() in destnames:
+                merge_trees(srcname, os.path.join(dest, destnames[n.lower()]))
+            else:
+                shutil.move(srcname, destname)
+        else:
+            shutil.move(srcname, destname)
+
+
+def extract_msi(path, dest_dir):
+    print('Extracting', os.path.basename(path), '...')
+    with open(os.path.join(dest_dir, os.path.basename(path) + '.listing'), 'w') as log:
+        subprocess.check_call(['msiextract', '-C', dest_dir, path], stdout=log)
+
+
+def extract_zipfile(zf, dest_dir):
+    tmp = os.path.join(dest_dir, "extract")
+    os.mkdir(tmp)
+    for f in zf.infolist():
+        name = unquote(f.filename)
+        dest = os.path.join(dest_dir, name)
+        extracted = zf.extract(f, tmp)
+        os.makedirs(os.path.dirname(dest), exist_ok=True)
+        shutil.move(extracted, dest)
+    shutil.rmtree(tmp)
+
+
+def extract_vsix(path, dest_dir):
+    print('Extracting', os.path.basename(path), '...')
+    with TemporaryDirectory(dir=dest_dir) as tdir, ZipFile(path, 'r') as zf:
+        extract_zipfile(zf, tdir)
+        contents = os.path.join(tdir, "Contents")
+        merge_trees(contents, dest_dir)
+        names = zf.namelist()
+    with open(os.path.join(dest_dir, os.path.basename(path) + '.listing'), 'w') as ls:
+        ls.write('\n'.join(names))
+
+
+def move_unpacked_trees(src_dir, dest_dir):
+    # CRT
+    crt_src = os.path.dirname(glob.glob(
+        os.path.join(src_dir, 'VC/Tools/MSVC/*/include'))[0])
+    crt_dest = os.path.join(dest_dir, 'crt')
+    os.makedirs(crt_dest)
+    merge_trees(os.path.join(crt_src, 'include'), os.path.join(crt_dest, 'include'))
+    merge_trees(os.path.join(crt_src, 'lib'), os.path.join(crt_dest, 'lib'))
+    merge_trees(os.path.join(crt_src, 'atlmfc', 'include'),
+                os.path.join(crt_dest, 'include'))
+    merge_trees(os.path.join(crt_src, 'atlmfc', 'lib'),
+                os.path.join(crt_dest, 'lib'))
+
+    # SDK
+    sdk_ver = glob.glob(os.path.join(src_dir, 'win11sdk_*_headers.msi.listing'))[0]
+    sdk_ver = sdk_ver.split('_')[1]
+    for x in glob.glob(os.path.join(src_dir, 'Program Files/Windows Kits/*/Include/*')):
+        if os.path.basename(x).startswith(sdk_ver):
+            sdk_ver = os.path.basename(x)
+            break
+    else:
+        raise SystemExit(f'Failed to find sdk_ver: {sdk_ver}')
+    sdk_include_src = glob.glob(os.path.join(
+        src_dir, f'Program Files/Windows Kits/*/Include/{sdk_ver}'))[0]
+    sdk_dest = os.path.join(dest_dir, 'sdk')
+    os.makedirs(sdk_dest)
+    merge_trees(sdk_include_src, os.path.join(sdk_dest, 'include'))
+    sdk_lib_src = glob.glob(os.path.join(
+        src_dir, f'Program Files/Windows Kits/*/Lib/{sdk_ver}'))[0]
+    merge_trees(sdk_lib_src, os.path.join(sdk_dest, 'lib'))
+
+    # UCRT
+    if os.path.exists(os.path.join(sdk_include_src, 'ucrt')):
+        return
+    ucrt_include_src = glob.glob(os.path.join(
+        src_dir, 'Program Files/Windows Kits/*/Include/*/ucrt'))[0]
+    merge_trees(ucrt_include_src, os.path.join(sdk_dest, 'include', 'ucrt'))
+    ucrt_lib_src = glob.glob(os.path.join(
+        src_dir, 'Program Files/Windows Kits/*/Lib/*/ucrt'))[0]
+    merge_trees(ucrt_lib_src, os.path.join(sdk_dest, 'lib', 'ucrt'))
+
+
+def unpack(src_dir, dest_dir):
+    if os.path.exists(dest_dir):
+        shutil.rmtree(dest_dir)
+    extract_dir = os.path.join(dest_dir, 'extract')
+    os.makedirs(extract_dir)
+    for x in os.listdir(src_dir):
+        path = os.path.join(src_dir, x)
+        ext = os.path.splitext(x)[1].lower()
+        if ext =='.msi':
+            extract_msi(path, extract_dir)
+        elif ext == '.vsix':
+            extract_vsix(path, extract_dir)
+        elif ext == '.cab':
+            continue
+        else:
+            raise SystemExit(f'Unknown downloaded file type: {x}')
+    move_unpacked_trees(extract_dir, dest_dir)
+    shutil.rmtree(extract_dir)
+
+
+def symlink_transformed(path, transform=str.lower):
+    base, name = os.path.split(path)
+    lname = transform(name)
+    if lname != name:
+        npath = os.path.join(base, lname)
+        if not os.path.lexists(npath):
+            os.symlink(name, npath)
+
+
+def clone_tree(src_dir, dest_dir):
+    os.makedirs(dest_dir)
+    for dirpath, dirnames, filenames in os.walk(src_dir):
+        for d in dirnames:
+            path = os.path.join(dirpath, d)
+            rpath = os.path.relpath(path, src_dir)
+            dpath = os.path.join(dest_dir, rpath)
+            os.makedirs(dpath)
+            symlink_transformed(dpath)
+        for f in filenames:
+            if f.lower().endswith('.pdb'):
+                continue
+            path = os.path.join(dirpath, f)
+            rpath = os.path.relpath(path, src_dir)
+            dpath = os.path.join(dest_dir, rpath)
+            os.link(path, dpath)
+            symlink_transformed(dpath)
+
+
+def files_in(path):
+    for dirpath, _, filenames in os.walk(path):
+        for f in filenames:
+            yield os.path.relpath(os.path.join(dirpath, f), path)
+
+
+def create_include_symlinks(path, include_root, include_files):
+    ' Create symlinks for include entries in header files whose case does not match '
+    with open(path, 'rb') as f:
+        src = f.read()
+    for m in re.finditer(rb'^#include\s+([<"])(.+?)[>"]', src, flags=re.M):
+        spec = m.group(2).decode().replace('\\', '/')
+        lspec = spec.lower()
+        if spec == lspec:
+            continue
+        is_local = m.group(1).decode() == '"'
+        found = ''
+        lmatches = []
+        for ir, specs in include_files.items():
+            if spec in specs:
+                found = ir
+                break
+            if lspec in specs:
+                lmatches.append(ir)
+
+        if found and (not is_local or found == include_root):
+            continue
+        if lmatches:
+            if is_local and include_root in lmatches:
+                fr = include_root
+            else:
+                fr = lmatches[0]
+            symlink_transformed(os.path.join(fr, lspec), lambda n: os.path.basename(spec))
+
+
+def setup(splat_dir, root_dir, arch):
+    print('Creating symlinks...')
+    msarch = llvm_arch_to_ms_arch(arch)
+    if os.path.exists(root_dir):
+        shutil.rmtree(root_dir)
+    os.makedirs(root_dir)
+    # CRT
+    clone_tree(os.path.join(splat_dir, 'crt', 'include'), os.path.join(root_dir, 'crt', 'include'))
+    clone_tree(os.path.join(splat_dir, 'crt', 'lib', 'spectre', msarch), os.path.join(root_dir, 'crt', 'lib'))
+    # SDK
+    clone_tree(os.path.join(splat_dir, 'sdk', 'include'), os.path.join(root_dir, 'sdk', 'include'))
+    for x in glob.glob(os.path.join(splat_dir, 'sdk', 'lib', '*', msarch)):
+        clone_tree(x, os.path.join(root_dir, 'sdk', 'lib', os.path.basename(os.path.dirname(x))))
+    include_roots = [x for x in glob.glob(os.path.join(root_dir, 'sdk', 'include', '*')) if os.path.isdir(x)]
+    include_roots.append(os.path.join(root_dir, 'crt', 'include'))
+    include_files = {x:set(files_in(x)) for x in include_roots}
+    for ir, files in include_files.items():
+        files_to_check = []
+        for relpath in files:
+            path = os.path.join(ir, relpath)
+            if not os.path.islink(path):
+                files_to_check.append(path)
+        for path in files_to_check:
+            create_include_symlinks(path, ir, include_files)
+
+
+def main(args=sys.argv[1:]):
+    stages = ('download', 'unpack', 'setup')
+    p = argparse.ArgumentParser(
+        description='Setup the headers and libraries for cross-compilation of windows binaries')
+    p.add_argument(
+        'stages', metavar='STAGES', nargs='*', help=(
+            f'The stages to run by default all stages are run. Stages are: {" ".join(stages)}'))
+    p.add_argument(
+        '--manifest-version', default=17, type=int, help='The manifest version to use to find the packages to install')
+    p.add_argument(
+        '--manifest-path', default='', help='Path to a local manifest file to use. Causes --manifest-version to be ignored.')
+    p.add_argument(
+        '--crt-variant', default='desktop', choices=('desktop', 'store', 'onecore'), help='The type of CRT to download')
+    p.add_argument(
+        '--arch', default='x86_64', choices=('x86_64', 'aarch64'), help='The architecture to install')
+    p.add_argument('--dest', default='.', help='The directory to install into')
+    args = p.parse_args(args)
+    if args.dest == '.':
+        args.dest = os.getcwd()
+    stages = args.stages or stages
+    dl_dir = os.path.join(args.dest, 'dl')
+    splat_dir = os.path.join(args.dest, 'splat')
+    root_dir = os.path.join(args.dest, 'root')
+    for stage in stages:
+        if stage == 'download':
+            download(dl_dir, manifest_version=args.manifest_version, manifest_path=args.manifest_path, crt_variant=args.crt_variant, arch=args.arch)
+        elif stage == 'unpack':
+            unpack(dl_dir, splat_dir)
+        elif stage == 'setup':
+            setup(splat_dir, root_dir, args.arch)
+        else:
+            raise SystemExit(f'Unknown stage: {stage}')
+
+
+if __name__ == '__main__':
+    pprint
+    main()
diff --git a/setup/xwin.py b/setup/xwin.py
index 9703ee732f..f9328d395f 100644
--- a/setup/xwin.py
+++ b/setup/xwin.py
@@ -2,6 +2,7 @@
 # License: GPLv3 Copyright: 2023, Kovid Goyal <kovid at kovidgoyal.net>
 
 
+import os, runpy
 import shutil
 
 from setup import Command
@@ -11,15 +12,15 @@ class XWin(Command):
     description = 'Install the Windows headers for cross compilation'
 
     def run(self, opts):
-        import subprocess
-        cache_dir = '.build-cache/xwin'
-        output_dir = cache_dir + '/splat'
-        cmd = f'xwin --include-atl --accept-license --cache-dir {cache_dir}'.split()
-        for step in 'download unpack'.split():
-            try:
-                subprocess.check_call(cmd + [step])
-            except FileNotFoundError:
-                raise SystemExit('xwin not found install it from https://github.com/Jake-Shadle/xwin/releases')
-        subprocess.check_call(cmd + ['splat', '--output', output_dir])
-        shutil.rmtree(f'{cache_dir}/dl')
-        shutil.rmtree(f'{cache_dir}/unpack')
+        if not shutil.which('msiextract'):
+            raise SystemExit('No msiextract found in PATH you may need to install msitools')
+        base = os.path.join(os.path.dirname(self.SRC), 'setup')
+        m = runpy.run_path(os.path.join(base, 'wincross.py'))
+        cache_dir = os.path.join(base, '.build-cache/xwin')
+        if os.path.exists(cache_dir):
+            shutil.rmtree(cache_dir)
+        os.makedirs(cache_dir)
+        m.main(['--dest', cache_dir])
+        for x in os.listdir(cache_dir):
+            if x != 'root':
+                shutil.rmtree(f'{cache_dir}/{x}')