diff --git a/core/libs/prx/libkernel/CMakeLists.txt b/core/libs/prx/libkernel/CMakeLists.txt
index 2ac2209a96..c474c5c20d 100644
--- a/core/libs/prx/libkernel/CMakeLists.txt
+++ b/core/libs/prx/libkernel/CMakeLists.txt
@@ -2036,6 +2036,15 @@ if(BUILD_TESTING)
     target_include_directories(guest_timed_join_tests PRIVATE ${LIBS_INCLUDE_DIR})
     target_link_libraries(guest_timed_join_tests PRIVATE libkernel libc ${CMAKE_DL_LIBS})
     configure_windows_unwind(guest_timed_join_tests)
+    if(WIN32 AND Python3_Interpreter_FOUND)
+        foreach(joinProvider IN ITEMS libkernel_sys libkernel_web)
+            add_test(NAME guest_timed_join_import_${joinProvider} COMMAND ${Python3_EXECUTABLE}
+                ${LIBS_INCLUDE_DIR}/tests/test_windows_timed_join_imports.py $<TARGET_FILE:relinker> ${PATCHED_DIR}
+                ${joinProvider}.prx $<TARGET_FILE_DIR:guest_timed_join_tests>)
+            set_tests_properties(guest_timed_join_import_${joinProvider} PROPERTIES TIMEOUT 25
+                ENVIRONMENT_MODIFICATION "PATH=path_list_prepend:$<TARGET_FILE_DIR:guest_timed_join_tests>")
+        endforeach()
+    endif()
     foreach(joinMode IN ITEMS normal coarse)
         add_test(NAME guest_timed_join_${joinMode} COMMAND guest_timed_join_tests $<TARGET_FILE:libkernel>)
         set_tests_properties(guest_timed_join_${joinMode} PROPERTIES TIMEOUT 15)
diff --git a/core/libs/tests/test_windows_timed_join_imports.py b/core/libs/tests/test_windows_timed_join_imports.py
new file mode 100644
index 0000000000..4a5eeef09c
--- /dev/null
+++ b/core/libs/tests/test_windows_timed_join_imports.py
@@ -0,0 +1,86 @@
+import os
+import shutil
+import struct
+import subprocess
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[2] / 'relinker' / 'relinker' / 'tests'))
+from guest_import_fixtures import executable, fixture_directory
+
+
+def call(code, slot):
+    code.extend(b'\xff\x15' + struct.pack('<i', slot - (0x4000 + len(code) + 6)))
+
+
+def fixture(variant, label):
+    image = executable(variant, 'PkS44IGrDkM#A#B', extra_symbols=('OxhIB8LB-PQ#A#B',))
+    code = bytearray(b'\x48\x83\xec\x38')
+    if label == 'join':
+        code.extend(b'\x48\x8d\x3c\x24\x31\xf6')
+        code.extend(b'\x48\x8d\x15' + struct.pack('<i', 0x4300 - (0x4000 + len(code) + 7)))
+        code.extend(b'\x48\xb9' + struct.pack('<Q', 0x123456789abcdef))
+        call(code, 0x4a28)
+        code.extend(b'\x85\xc0\x0f\x85')
+        create_failure = len(code)
+        code.extend(bytes(4))
+        code.extend(b'\x48\x8b\x3c\x24\x48\x8d\x74\x24\x08')
+        code.extend(b'\x48\xb8' + struct.pack('<Q', 0x7fffffffffffffff))
+        code.extend(b'\x48\x89\x44\x24\x10')
+        code.extend(b'\x48\xc7\x44\x24\x18' + struct.pack('<I', 999999999))
+        code.extend(b'\x48\x8d\x54\x24\x10')
+        call(code, 0x4a20)
+        code.extend(b'\x85\xc0\x0f\x85')
+        join_failure = len(code)
+        code.extend(bytes(4))
+        code.extend(b'\x48\xba' + struct.pack('<Q', 0x123456789abcdef))
+        code.extend(b'\x48\x39\x54\x24\x08\x0f\x85')
+        value_failure = len(code)
+        code.extend(bytes(4))
+        code.extend(b'\x31\xc0\x48\x83\xc4\x38\xc3')
+        failure = len(code)
+        code.extend(b'\xb8\x63\x00\x00\x00\x48\x83\xc4\x38\xc3')
+        for offset in (create_failure, join_failure, value_failure):
+            struct.pack_into('<i', code, offset, failure - offset - 4)
+        image[0x4300:0x4304] = b'\x48\x89\xf8\xc3'
+    else:
+        thread = 1 if label == 'invalid-deadline' else 0
+        code.extend(b'\xbf' + struct.pack('<I', thread) + b'\x31\xf6\x31\xd2')
+        if label != 'null-deadline':
+            code.extend(b'\x48\xc7\x44\x24\x10' + struct.pack('<i', -1 if thread else 0))
+            code.extend(b'\x48\xc7\x44\x24\x18\x00\x00\x00\x00')
+            code.extend(b'\x48\x8d\x54\x24\x10')
+        call(code, 0x4a20)
+        code.extend(b'\x48\x83\xc4\x38\xc3')
+    image[0x4000:0x4000 + len(code)] = code
+    return image
+
+
+def main():
+    assert os.name == 'nt'
+    relinker, libraries = (Path(value).resolve() for value in sys.argv[1:3])
+    variant = sys.argv[3]
+    runtime = Path(sys.argv[4]).resolve()
+    assert variant in ('libkernel_sys.prx', 'libkernel_web.prx')
+    with fixture_directory('anyps5-timed-join-') as directory:
+        work = Path(directory)
+        (work / 'libs').mkdir()
+        (work / 'prx').mkdir()
+        for name in (variant, 'libkernel.prx', 'libc.prx'):
+            shutil.copy2(libraries / name, work / 'libs' / name)
+        for name in ('libgcc_s_seh-1.dll', 'libstdc++-6.dll', 'libwinpthread-1.dll'):
+            shutil.copy2(runtime / name, work / 'libs' / name)
+        for label, expected in (('null-deadline', 22), ('invalid-deadline', 22), ('null-thread', 22), ('join', 0)):
+            source = work / 'input.elf'
+            source.write_bytes(fixture(variant, label))
+            output = work / (label + '.exe')
+            result = subprocess.run([str(relinker), '--windows', str(source), str(output)],
+                                    capture_output=True, text=True, timeout=10)
+            assert result.returncode == 0, (variant, label, result.stderr)
+            result = subprocess.run([str(output)], cwd=work, capture_output=True, text=True, timeout=10)
+            assert result.returncode == expected, (variant, label, result.returncode, result.stderr)
+    print(variant + ': scoped timed-join validation and shared thread lifecycle passed')
+
+
+if __name__ == '__main__':
+    main()