diff --git a/stubs/pywin32/win32/win32file.pyi b/stubs/pywin32/win32/win32file.pyi
index 4cb0def25531..c2f9fb84c833 100644
--- a/stubs/pywin32/win32/win32file.pyi
+++ b/stubs/pywin32/win32/win32file.pyi
@@ -1,4 +1,4 @@
-from _typeshed import Incomplete, WriteableBuffer
+from _typeshed import Incomplete, ReadableBuffer, WriteableBuffer
 from socket import socket
 from typing import TypeVar, overload
 from typing_extensions import deprecated
@@ -32,7 +32,24 @@ def SetMailslotInfo(Mailslot: int, ReadTimeout, /) -> None: ...
 def DefineDosDevice(flags, deviceName: str, targetPath: str, /) -> None: ...
 def DefineDosDeviceW(flags, deviceName: str, targetPath: str, /) -> None: ...
 def DeleteFile(fileName: str, /) -> None: ...
-def DeviceIoControl(Device: int, IoControlCode, InBuffer, OutBuffer, Overlapped: _win32typing.PyOVERLAPPED | None = ...): ...
+
+@overload
+def DeviceIoControl(
+    Device: int, IoControlCode: int, InBuffer: ReadableBuffer | None, OutBuffer: int, Overlapped: None = None
+) -> bytes: ...
+@overload
+def DeviceIoControl(
+    Device: int, IoControlCode: int, InBuffer: ReadableBuffer | None, OutBuffer: int, Overlapped: _win32typing.PyOVERLAPPED
+) -> memoryview: ...
+@overload
+def DeviceIoControl(
+    Device: int,
+    IoControlCode: int,
+    InBuffer: ReadableBuffer | None,
+    OutBuffer: WriteableBuffer,
+    Overlapped: _win32typing.PyOVERLAPPED | None = None,
+) -> WriteableBuffer: ...
+
 def FindClose(hFindFile, /) -> None: ...
 def FindCloseChangeNotification(hChangeHandle, /) -> None: ...
 def FindFirstChangeNotification(pathName: str, bWatchSubtree, notifyFilter, /): ...
diff --git a/stubs/pywin32/win32/win32pipe.pyi b/stubs/pywin32/win32/win32pipe.pyi
index 14779bdc04ff..2a6e39f38212 100644
--- a/stubs/pywin32/win32/win32pipe.pyi
+++ b/stubs/pywin32/win32/win32pipe.pyi
@@ -9,7 +9,7 @@ def GetNamedPipeHandleState(
 def SetNamedPipeHandleState(
     hPipe: int, Mode: int, MaxCollectionCount: None | Incomplete, CollectDataTimeout: None | Incomplete, /
 ) -> None: ...
-def ConnectNamedPipe(hPipe: int, overlapped: _win32typing.PyOVERLAPPED | None = ..., /): ...
+def ConnectNamedPipe(hPipe: int, overlapped: _win32typing.PyOVERLAPPED | None = ..., /) -> int: ...
 def TransactNamedPipe(
     pipeName,
     writeData: str,
@@ -22,20 +22,20 @@ def CreatePipe(sa: _win32typing.PySECURITY_ATTRIBUTES, nSize: int, /) -> tuple[i
 def FdCreatePipe(sa: _win32typing.PySECURITY_ATTRIBUTES, nSize, mode, /) -> tuple[Incomplete, Incomplete]: ...
 def CreateNamedPipe(
     pipeName: str,
-    openMode,
-    pipeMode,
-    nMaxInstances,
-    nOutBufferSize,
-    nInBufferSize,
-    nDefaultTimeOut,
+    openMode: int,
+    pipeMode: int,
+    nMaxInstances: int,
+    nOutBufferSize: int,
+    nInBufferSize: int,
+    nDefaultTimeOut: int,
     sa: _win32typing.PySECURITY_ATTRIBUTES,
     /,
 ) -> int: ...
 def DisconnectNamedPipe(hFile: int, /) -> None: ...
 def GetOverlappedResult(hFile: int, overlapped: _win32typing.PyOVERLAPPED, bWait: int | bool, /) -> int: ...
-def WaitNamedPipe(pipeName: str, timeout, /) -> None: ...
+def WaitNamedPipe(pipeName: str, timeout: int, /) -> None: ...
 def GetNamedPipeInfo(hNamedPipe: int, /) -> tuple[int, int, int, int]: ...
-def PeekNamedPipe(hPipe: int, size: int, /) -> tuple[str, int, Incomplete]: ...
+def PeekNamedPipe(hPipe: int, size: int, /) -> tuple[bytes, int, int]: ...
 def GetNamedPipeClientProcessId(hPipe: int, /): ...
 def GetNamedPipeServerProcessId(hPipe: int, /): ...
 def GetNamedPipeClientSessionId(hPipe: int, /): ...