diff --git a/libc/nt/enum/memflags.h b/libc/nt/enum/memflags.h
index 033d3fa3cbf..f2eb173f6d8 100644
--- a/libc/nt/enum/memflags.h
+++ b/libc/nt/enum/memflags.h
@@ -16,4 +16,7 @@
 #define kNtMemLargePages 0x20000000
 #define kNtMem4mbPages   0x80000000
 
+#define kNtMemReplacePlaceholder 0x00004000
+#define kNtMemLargePages         0x20000000
+
 #endif /* COSMOPOLITAN_LIBC_NT_ENUM_MEMFLAGS_H_ */
diff --git a/libc/nt/kernel32/MapViewOfFile3.S b/libc/nt/kernel32/MapViewOfFile3.S
new file mode 100644
index 00000000000..2b242dfd335
--- /dev/null
+++ b/libc/nt/kernel32/MapViewOfFile3.S
@@ -0,0 +1,18 @@
+#include "libc/nt/codegen.h"
+.imp	kernel32,__imp_MapViewOfFile3,MapViewOfFile3
+
+	.text.windows
+	.ftrace1
+MapViewOfFile3:
+	.ftrace2
+#ifdef __x86_64__
+	push	%rbp
+	mov	%rsp,%rbp
+	mov	__imp_MapViewOfFile3(%rip),%rax
+	jmp	__sysv2nt10
+#elif defined(__aarch64__)
+	mov	x0,#0
+	ret
+#endif
+	.endfn	MapViewOfFile3,globl
+	.previous
diff --git a/libc/nt/master.sh b/libc/nt/master.sh
index 5529622ea7d..ace1dbf5774 100755
--- a/libc/nt/master.sh
+++ b/libc/nt/master.sh
@@ -203,6 +203,7 @@ imp	'LoadResource'						LoadResource						kernel32	2
 imp	'LocalFree'						LocalFree						kernel32	1
 imp	'LockFile'						LockFile						kernel32	5
 imp	'LockResource'						LockResource						kernel32	1
+imp	'MapViewOfFile3'					MapViewOfFile3						kernel32	9
 imp	'MoveFile'						MoveFileW						kernel32	2
 imp	'MultiByteToWideChar'					MultiByteToWideChar					kernel32	6
 imp	'OfferVirtualMemory'					OfferVirtualMemory					kernel32	3
diff --git a/libc/nt/memory.h b/libc/nt/memory.h
index 68ac1ef8356..4923ba1f045 100644
--- a/libc/nt/memory.h
+++ b/libc/nt/memory.h
@@ -1,5 +1,6 @@
 #ifndef COSMOPOLITAN_LIBC_NT_MEMORY_H_
 #define COSMOPOLITAN_LIBC_NT_MEMORY_H_
+#include "libc/nt/struct/memextendedparameter.h"
 #include "libc/nt/struct/memorybasicinformation.h"
 #include "libc/nt/struct/memoryrangeentry.h"
 #include "libc/nt/struct/securityattributes.h"
@@ -82,6 +83,19 @@ void *HeapReAlloc(int64_t hHeap, uint32_t dwFlags, void *lpMem,
 void *GlobalAlloc(uint32_t uFlags, uint64_t dwBytes) __wur;
 void *GlobalFree(void *hMem);
 
+/**
+ * @param AllocationType
+ *     - kNtMemReserve
+ *     - kNtMemReplacePlaceholder
+ *     - kNtMemLargePages
+ */
+void *MapViewOfFile3(
+    intptr_t FileMapping, intptr_t Process, void *opt_BaseAddress,
+    uint64_t Offset, size_t ViewSize, unsigned AllocationType,
+    unsigned PageProtection,
+    struct NtMemExtendedParameter *in_out_opt_ExtendedParameters,
+    unsigned ParameterCount);
+
 #if ShouldUseMsabiAttribute()
 #include "libc/nt/thunk/memory.inc"
 #endif /* ShouldUseMsabiAttribute() */
diff --git a/libc/nt/struct/memextendedparameter.h b/libc/nt/struct/memextendedparameter.h
new file mode 100644
index 00000000000..6cd4d0f5db5
--- /dev/null
+++ b/libc/nt/struct/memextendedparameter.h
@@ -0,0 +1,34 @@
+#ifndef COSMOPOLITAN_LIBC_NT_STRUCT_MEMEXTENDEDPARAMETER_H_
+#define COSMOPOLITAN_LIBC_NT_STRUCT_MEMEXTENDEDPARAMETER_H_
+
+#define kNtMemExtendedParameterTypeBits 8
+
+#define kNtMemExtendedParameterInvalidType         0
+#define kNtMemExtendedParameterAddressRequirements 1
+#define kNtMemExtendedParameterNumaNode            2
+#define kNtMemExtendedParameterPartitionHandle     3
+#define kNtMemExtendedParameterUserPhysicalHandle  4
+#define kNtMemExtendedParameterAttributeFlags      5
+#define kNtMemExtendedParameterMax                 6
+
+#define kNtMemExtendedParameterGraphics          0x00000001
+#define kNtMemExtendedParameterNonpaged          0x00000002
+#define kNtMemExtendedParameterZeroPagesOptional 0x00000004
+#define kNtMemExtendedParameterNonpagedLarge     0x00000008
+#define kNtMemExtendedParameterNonpagedHuge      0x00000010
+
+struct NtMemExtendedParameter {
+  struct {
+    uint64_t Type : kNtMemExtendedParameterTypeBits;
+    uint64_t Reserved : 64 - kNtMemExtendedParameterTypeBits;
+  } DUMMYSTRUCTNAME;
+  union {
+    uint64_t ULong64;
+    void *Pointer;
+    size_t Size;
+    intptr_t Handle;
+    unsigned ULong;
+  } DUMMYUNIONNAME;
+};
+
+#endif /* COSMOPOLITAN_LIBC_NT_STRUCT_MEMEXTENDEDPARAMETER_H_ */