diff --git a/vhd/mksyscall_windows.go b/vhd/mksyscall_windows.go
index e216f47..977fef8 100644
--- a/vhd/mksyscall_windows.go
+++ b/vhd/mksyscall_windows.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// Hard-coding unicode mode for VHD library.
+
 // +build ignore
 
 /*
@@ -556,8 +558,7 @@ func (f *Fn) HelperCallParamList() string {
 // IsUTF16 is true, if f is W (utf16) function. It is false
 // for all A (ascii) functions.
 func (f *Fn) IsUTF16() bool {
-	s := f.DLLFuncName()
-	return s[len(s)-1] == 'W'
+	return true
 }
 
 // StrconvFunc returns name of Go string to OS string function for f.
@@ -897,4 +898,4 @@ func {{.HelperName}}({{.HelperParamList}}) {{template "results" .}}{
 {{define "printtrace"}}{{if .PrintTrace}}	print("SYSCALL: {{.Name}}(", {{.ParamPrintList}}") (", {{.Rets.PrintList}}")\n")
 {{end}}{{end}}
 
-`
\ No newline at end of file
+`
diff --git a/vhd/vhd.go b/vhd/vhd.go
new file mode 100644
index 0000000..32f0701
--- /dev/null
+++ b/vhd/vhd.go
@@ -0,0 +1,82 @@
+// +build windows
+
+package vhd
+
+import "syscall"
+
+//go:generate go run mksyscall_windows.go -output zvhd.go vhd.go
+
+//sys createVirtualDisk(virtualStorageType *virtualStorageType, path string, virtualDiskAccessMask uint32, securityDescriptor *uintptr, flags uint32, providerSpecificFlags uint32, parameters *createVirtualDiskParameters, o *syscall.Overlapped, handle *syscall.Handle) (err error) [failretval != 0] = VirtDisk.CreateVirtualDisk
+
+type virtualStorageType struct {
+	DeviceID uint32
+	VendorID [16]byte
+}
+
+const virtualDiskAccessNONE uint32 = 0
+const virtualDiskAccessATTACHRO uint32 = 65536
+const virtualDiskAccessATTACHRW uint32 = 131072
+const virtualDiskAccessDETACH uint32 = 262144
+const virtualDiskAccessGETINFO uint32 = 524288
+const virtualDiskAccessCREATE uint32 = 1048576
+const virtualDiskAccessMETAOPS uint32 = 2097152
+const virtualDiskAccessREAD uint32 = 851968
+const virtualDiskAccessALL uint32 = 4128768
+const virtualDiskAccessWRITABLE uint32 = 3276800
+
+const createVirtualDiskFlagNone uint32 = 0
+const createVirtualDiskFlagFullPhysicalAllocation uint32 = 1
+const createVirtualDiskFlagPreventWritesToSourceDisk uint32 = 2
+const createVirtualDiskFlagDoNotCopyMetadataFromParent uint32 = 4
+
+type version2 struct {
+	UniqueID                 [16]byte // GUID
+	MaximumSize              uint64
+	BlockSizeInBytes         uint32
+	SectorSizeInBytes        uint32
+	ParentPath               *uint16 // string
+	SourcePath               *uint16 // string
+	OpenFlags                uint32
+	ParentVirtualStorageType virtualStorageType
+	SourceVirtualStorageType virtualStorageType
+	ResiliencyGUID           [16]byte // GUID
+}
+
+type createVirtualDiskParameters struct {
+	Version  uint32 // Must always be set to 2
+	Version2 version2
+}
+
+// CreateVhdx will create a simple vhdx file at the given path using default values.
+func CreateVhdx(path string, maxSizeInGb, blockSizeInMb uint32) error {
+	var defaultType virtualStorageType
+
+	parameters := createVirtualDiskParameters{
+		Version: 2,
+		Version2: version2{
+			MaximumSize:      uint64(maxSizeInGb) * 1024 * 1024 * 1024,
+			BlockSizeInBytes: blockSizeInMb * 1024 * 1024,
+		},
+	}
+
+	var handle syscall.Handle
+
+	if err := createVirtualDisk(
+		&defaultType,
+		path,
+		virtualDiskAccessNONE,
+		nil,
+		createVirtualDiskFlagNone,
+		0,
+		&parameters,
+		nil,
+		&handle); err != nil {
+		return err
+	}
+
+	if err := syscall.CloseHandle(handle); err != nil {
+		return err
+	}
+
+	return nil
+}
diff --git a/vhd/zvhd.go b/vhd/zvhd.go
new file mode 100644
index 0000000..c450955
--- /dev/null
+++ b/vhd/zvhd.go
@@ -0,0 +1,64 @@
+// MACHINE GENERATED BY 'go generate' COMMAND; DO NOT EDIT
+
+package vhd
+
+import (
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+var _ unsafe.Pointer
+
+// Do the interface allocations only once for common
+// Errno values.
+const (
+	errnoERROR_IO_PENDING = 997
+)
+
+var (
+	errERROR_IO_PENDING error = syscall.Errno(errnoERROR_IO_PENDING)
+)
+
+// errnoErr returns common boxed Errno values, to prevent
+// allocations at runtime.
+func errnoErr(e syscall.Errno) error {
+	switch e {
+	case 0:
+		return nil
+	case errnoERROR_IO_PENDING:
+		return errERROR_IO_PENDING
+	}
+	// TODO: add more here, after collecting data on the common
+	// error values see on Windows. (perhaps when running
+	// all.bat?)
+	return e
+}
+
+var (
+	modVirtDisk = windows.NewLazySystemDLL("VirtDisk.dll")
+
+	procCreateVirtualDisk = modVirtDisk.NewProc("CreateVirtualDisk")
+)
+
+func createVirtualDisk(virtualStorageType *virtualStorageType, path string, virtualDiskAccessMask uint32, securityDescriptor *uintptr, flags uint32, providerSpecificFlags uint32, parameters *createVirtualDiskParameters, o *syscall.Overlapped, handle *syscall.Handle) (err error) {
+	var _p0 *uint16
+	_p0, err = syscall.UTF16PtrFromString(path)
+	if err != nil {
+		return
+	}
+	return _createVirtualDisk(virtualStorageType, _p0, virtualDiskAccessMask, securityDescriptor, flags, providerSpecificFlags, parameters, o, handle)
+}
+
+func _createVirtualDisk(virtualStorageType *virtualStorageType, path *uint16, virtualDiskAccessMask uint32, securityDescriptor *uintptr, flags uint32, providerSpecificFlags uint32, parameters *createVirtualDiskParameters, o *syscall.Overlapped, handle *syscall.Handle) (err error) {
+	r1, _, e1 := syscall.Syscall9(procCreateVirtualDisk.Addr(), 9, uintptr(unsafe.Pointer(virtualStorageType)), uintptr(unsafe.Pointer(path)), uintptr(virtualDiskAccessMask), uintptr(unsafe.Pointer(securityDescriptor)), uintptr(flags), uintptr(providerSpecificFlags), uintptr(unsafe.Pointer(parameters)), uintptr(unsafe.Pointer(o)), uintptr(unsafe.Pointer(handle)))
+	if r1 != 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}