diff -urN pywin32-b304-orig/isapi/src/PyExtensionObjects.cpp pywin32-b304/isapi/src/PyExtensionObjects.cpp
--- pywin32-b304-orig/isapi/src/PyExtensionObjects.cpp	2022-05-02 15:48:48.000000000 +0800
+++ pywin32-b304/isapi/src/PyExtensionObjects.cpp	2022-11-06 01:33:42.690804700 +0800
@@ -803,7 +803,7 @@
 
     BOOL bRes;
     Py_BEGIN_ALLOW_THREADS bRes =
-        ecb->ServerSupportFunction(ecb->ConnID, HSE_REQ_IO_COMPLETION, DoIOCallback, NULL, NULL);
+        ecb->ServerSupportFunction(ecb->ConnID, HSE_REQ_IO_COMPLETION, (LPVOID)DoIOCallback, NULL, NULL);
     Py_END_ALLOW_THREADS if (!bRes) return SetPyECBError("ServerSupportFunction(HSE_REQ_IO_COMPLETION)");
     Py_RETURN_NONE;
 }
diff -urN pywin32-b304-orig/isapi/src/PyFilterObjects.cpp pywin32-b304/isapi/src/PyFilterObjects.cpp
--- pywin32-b304-orig/isapi/src/PyFilterObjects.cpp	2022-05-02 15:48:48.000000000 +0800
+++ pywin32-b304/isapi/src/PyFilterObjects.cpp	2022-11-06 01:33:42.705805600 +0800
@@ -306,7 +306,7 @@
         // The Java code passes "\r\n" as first DWORD, and header in second,
         // but docs clearly have second as unused.  Either way, I can't see the
         // specific header!
-        bRes = phfc->m_pfc->ServerSupportFunction(SF_REQ_SEND_RESPONSE_HEADER, status, (DWORD)header, 0);
+        bRes = phfc->m_pfc->ServerSupportFunction(SF_REQ_SEND_RESPONSE_HEADER, status, (DWORD_PTR)header, 0);
     Py_END_ALLOW_THREADS if (!bRes) return SetPyHFCError("SendResponseHeader");
     Py_INCREF(Py_None);
     return Py_None;
diff -urN pywin32-b304-orig/isapi/src/PythonEng.h pywin32-b304/isapi/src/PythonEng.h
--- pywin32-b304-orig/isapi/src/PythonEng.h	2022-05-02 15:48:48.000000000 +0800
+++ pywin32-b304/isapi/src/PythonEng.h	2022-11-06 01:33:42.714806100 +0800
@@ -63,7 +63,7 @@
     PyObject *DoCallback(HANDLER_TYPE typ, PyObject *args);
 
     bool LoadHandler(bool reload);
-    bool CPythonHandler::CheckCallback(const char *cbname, PyObject **cb);
+    bool CheckCallback(const char *cbname, PyObject **cb);
     const char *m_namefactory;
     const char *m_nameinit;
     const char *m_namedo;