if err != nil {
		return Data{}, fmt.Errorf("MapViewOfFile %s: %w", f.Name(), err)
	}
	var info windows.MemoryBasicInformation
	err = windows.VirtualQuery(addr, &info, unsafe.Sizeof(info))
	if err != nil {
		return Data{}, fmt.Errorf("VirtualQuery %s: %w", f.Name(), err)
	}
	data := unsafe.Slice((*byte)(unsafe.Pointer(addr)), int(info.RegionSize))
	return Data{f, data}, nil

//sys	SetFileInformationByHandle(handle syscall.Handle, fileInformationClass uint32, buf unsafe.Pointer, bufsize uint32) (err error) = kernel32.SetFileInformationByHandle
//sys	VirtualQuery(address uintptr, buffer *MemoryBasicInformation, length uintptr) (err error) = kernel32.VirtualQuery
//sys	GetTempPath2(buflen uint32, buf *uint16) (n uint32, err error) = GetTempPath2W

const (
	// flags for CreateToolhelp32Snapshot
	TH32CS_SNAPMODULE   = 0x08

	procSetFileInformationByHandle        = modkernel32.NewProc("SetFileInformationByHandle")
	procUnlockFileEx                      = modkernel32.NewProc("UnlockFileEx")
	procVirtualQuery                      = modkernel32.NewProc("VirtualQuery")
	procNetShareAdd                       = modnetapi32.NewProc("NetShareAdd")
	procNetShareDel                       = modnetapi32.NewProc("NetShareDel")

	if res == 0 {
		print("runtime: VirtualQuery failed; errno=", getlasterror(), "\n")
		throw("VirtualQuery for stack base failed")
	}
	// The system leaves an 8K PAGE_GUARD region at the bottom of
	// the stack (in theory VirtualQuery isn't supposed to include
	// that, but it does). Add an additional 8K of slop for

//sys	VirtualProtectEx(process Handle, address uintptr, size uintptr, newProtect uint32, oldProtect *uint32) (err error) = kernel32.VirtualProtectEx
//sys	VirtualQuery(address uintptr, buffer *MemoryBasicInformation, length uintptr) (err error) = kernel32.VirtualQuery
//sys	VirtualQueryEx(process Handle, address uintptr, buffer *MemoryBasicInformation, length uintptr) (err error) = kernel32.VirtualQueryEx

	procVirtualProtectEx                                     = modkernel32.NewProc("VirtualProtectEx")
	procVirtualQuery                                         = modkernel32.NewProc("VirtualQuery")
	procVirtualQueryEx                                       = modkernel32.NewProc("VirtualQueryEx")
	procVirtualUnlock                                        = modkernel32.NewProc("VirtualUnlock")