diff --git a/cpython-windows/build.py b/cpython-windows/build.py
index 9195e071..74fc2422 100644
--- a/cpython-windows/build.py
+++ b/cpython-windows/build.py
@@ -65,7 +65,10 @@
     "_lzma": {
         "ignore_additional_depends": {"$(OutDir)liblzma$(PyDebugExt).lib"},
     },
-    "_msi": {},
+    "_msi": {
+        # Removed in 3.13.
+        "ignore_missing": True,
+    },
     "_overlapped": {},
     "_multiprocessing": {},
     "_socket": {},
@@ -352,6 +355,7 @@ def hack_props(
     xz_version = DOWNLOADS["xz"]["version"]
     zlib_version = DOWNLOADS["zlib"]["version"]
     tcltk_commit = DOWNLOADS["tk-windows-bin"]["git_commit"]
+    mpdecimal_version = DOWNLOADS["mpdecimal"]["version"]
 
     sqlite_path = td / ("sqlite-autoconf-%s" % sqlite_version)
     bzip2_path = td / ("bzip2-%s" % bzip2_version)
@@ -359,6 +363,7 @@ def hack_props(
     tcltk_path = td / ("cpython-bin-deps-%s" % tcltk_commit)
     xz_path = td / ("xz-%s" % xz_version)
     zlib_path = td / ("zlib-%s" % zlib_version)
+    mpdecimal_path = td / ("mpdecimal-%s" % mpdecimal_version)
 
     openssl_root = td / "openssl" / arch
     openssl_libs_path = openssl_root / "lib"
@@ -398,6 +403,9 @@ def hack_props(
             elif b"<zlibDir" in line:
                 line = b"<zlibDir>%s\\</zlibDir>" % zlib_path
 
+            elif b"<mpdecimalDir" in line:
+                line = b"<mpdecimalDir>%s\\</mpdecimalDir>" % mpdecimal_path
+
             lines.append(line)
 
     with python_props_path.open("wb") as fh:
@@ -1155,15 +1163,17 @@ def collect_python_build_artifacts(
         "_ctypes_test",
         "_testbuffer",
         "_testcapi",
+        "_testclinic_limited",
         "_testclinic",
         "_testconsole",
         "_testembed",
         "_testimportmultiple",
         "_testinternalcapi",
-        "_testsinglephase",
+        "_testlimitedcapi",
         "_testmultiphase",
-        "xxlimited",
+        "_testsinglephase",
         "xxlimited_35",
+        "xxlimited",
     }
 
     other_projects = {"pythoncore"}
@@ -1409,6 +1419,12 @@ def build_cpython(
     setuptools_wheel = download_entry("setuptools", BUILD)
     pip_wheel = download_entry("pip", BUILD)
 
+    # CPython 3.13+ no longer uses a bundled version by default
+    if meets_python_minimum_version(python_version, "3.13"):
+        mpdecimal_archive = download_entry("mpdecimal", BUILD)
+    else:
+        mpdecimal_archive = None
+
     if arch == "amd64":
         build_platform = "x64"
         build_directory = "amd64"
@@ -1426,12 +1442,16 @@ def build_cpython(
             for a in (
                 python_archive,
                 bzip2_archive,
+                mpdecimal_archive,
                 openssl_archive,
                 sqlite_archive,
                 tk_bin_archive,
                 xz_archive,
                 zlib_archive,
             ):
+                if a is None:
+                    continue
+
                 log("extracting %s to %s" % (a, td))
                 fs.append(e.submit(extract_tar_to_directory, a, td))
 
@@ -1599,11 +1619,6 @@ def build_cpython(
         if not meets_python_minimum_version(python_version, "3.12"):
             args.append("--include-distutils")
 
-        # CPython 3.13+ no longer uses a bundled libmpdec by default
-        # TODO(zanieb): We should use the system libmpdec as we do for Unix builds
-        if meets_python_minimum_version(python_version, "3.13"):
-            args.append("--with-system-libmpdec=no")
-
         args.extend(["--include-idle", "--include-stable", "--include-tcltk"])
 
         exec_and_log(
diff --git a/src/validation.rs b/src/validation.rs
index af94f7c6..434c1a32 100644
--- a/src/validation.rs
+++ b/src/validation.rs
@@ -125,6 +125,7 @@ const PE_ALLOWED_LIBRARIES: &[&str] = &[
     "python310.dll",
     "python311.dll",
     "python312.dll",
+    "python313.dll",
     "sqlite3.dll",
     "tcl86t.dll",
     "tk86t.dll",
@@ -679,7 +680,13 @@ const GLOBAL_EXTENSIONS: &[&str] = &[
 // We didn't build ctypes_test until 3.9.
 // We didn't build some test extensions until 3.9.
 
-const GLOBAL_EXTENSIONS_PYTHON_3_8: &[&str] = &["audioop", "_sha256", "_sha512", "parser"];
+const GLOBAL_EXTENSIONS_PYTHON_3_8: &[&str] = &[
+    "audioop",
+    "_sha256",
+    "_sha512",
+    "parser",
+    "_xxsubinterpreters",
+];
 
 const GLOBAL_EXTENSIONS_PYTHON_3_9: &[&str] = &[
     "audioop",
@@ -727,9 +734,7 @@ const GLOBAL_EXTENSIONS_PYTHON_3_13: &[&str] = &[
     "_interpqueues",
     "_interpreters",
     "_sha2",
-    "_suggestions",
     "_sysconfig",
-    "_testexternalinspection",
     "_tokenize",
     "_typing",
     "_zoneinfo",
@@ -759,16 +764,16 @@ const GLOBAL_EXTENSIONS_POSIX: &[&str] = &[
 const GLOBAL_EXTENSIONS_LINUX_PRE_3_13: &[&str] = &["spwd"];
 
 const GLOBAL_EXTENSIONS_WINDOWS: &[&str] = &[
-    "_msi",
     "_overlapped",
     "_winapi",
-    "_xxsubinterpreters",
     "msvcrt",
     "nt",
     "winreg",
     "winsound",
 ];
 
+const GLOBAL_EXTENSIONS_WINDOWS_PRE_3_13: &[&str] = &["_msi"];
+
 /// Extension modules not present in Windows static builds.
 const GLOBAL_EXTENSIONS_WINDOWS_NO_STATIC: &[&str] = &["_testinternalcapi", "_tkinter"];
 
@@ -1494,6 +1499,10 @@ fn validate_extension_modules(
     if is_windows {
         wanted.extend(GLOBAL_EXTENSIONS_WINDOWS);
 
+        if matches!(python_major_minor, "3.8" | "3.9" | "3.10" | "3.11" | "3.12") {
+            wanted.extend(GLOBAL_EXTENSIONS_WINDOWS_PRE_3_13);
+        }
+
         if static_crt {
             for x in GLOBAL_EXTENSIONS_WINDOWS_NO_STATIC {
                 wanted.remove(*x);
@@ -1949,9 +1958,10 @@ fn validate_distribution(
             // Static distributions never export symbols.
             let wanted = if is_static {
                 false
-            // For some strange reason _PyWarnings_Init is exported as part of the ABI.
+            // For some strange reason _PyWarnings_Init is exported as part of the ABI before
+            // Python 3.13.
             } else if name == "_warnings" {
-                true
+                matches!(python_major_minor, "3.8" | "3.9" | "3.10" | "3.11" | "3.12")
             // Windows dynamic doesn't export extension module init functions.
             } else if triple.contains("-windows-") {
                 false