diff --git a/vlib/os/types_win.v b/vlib/os/types_win.v
new file mode 100644
index 0000000000..de0349d2f6
--- /dev/null
+++ b/vlib/os/types_win.v
@@ -0,0 +1,140 @@
+module os
+
+// Ref - https://docs.microsoft.com/en-us/windows/desktop/winprog/windows-data-types
+
+type BOOL bool
+type BOOLEAN BOOL
+
+// A byte (8 bits)
+type BYTE u8
+
+// An 8-bit Windows (ANSI) character.
+type CHAR u8
+
+// An 16-bit Windows character.
+type WCHAR u16
+
+// A 32-bit signed integer. The range is -2147483648 through 2147483647 decimal.
+type INT i32
+
+// A signed integer type for pointer precision.
+type INT_PTR INT*
+
+// A pointer to an INT (INT32).
+type PINT INT*
+
+// A 8-bit signed integer.
+type INT8 i8
+
+// // A pointer to an INT8.
+type PINT8 INT8*
+
+// A 16-bit signed integer.
+type INT16 i16
+
+// // A pointer to an INT16.
+type PINT16 INT16*
+
+// A 32-bit signed integer.
+type INT32 i32 
+
+// A pointer to an INT32.
+type PINT32 INT32*
+
+// A 64-bit signed integer.
+type INT64 i64
+
+// A pointer to an INT64.
+type PINT64 INT64*
+
+// An unsigned INT. The range is 0 through 4294967295 decimal.
+type UINT u32
+
+// An unsigned INT_PTR.
+type UINT_PTR UINT*
+
+// An unsigned INT8.
+type UINT8 u8
+
+// An unsigned INT16.
+type UINT16 u16
+
+// An unsigned INT32.
+type UINT32 u32 
+
+// An unsigned INT64.
+type UINT64 u64
+
+// A 16-bit unsigned integer. The range is 0 through 65535 decimal.
+type WORD u16
+
+// A pointer to an WORD.
+type LPWORD WORD*
+
+// A 32-bit unsigned integer. The range is 0 through 4294967295 decimal.
+type DWORD u32
+
+// A pointer to an DWORD.
+type DWORD_PTR DWORD*
+type LPDWORD DWORD*
+
+// A 64-bit unsigned integer. The range is 0 through 18446744073709551615 decimal.
+type DWORDLONG u64 
+type PDWORDLONG DWORDLONG*
+
+// A 32-bit unsigned integer.
+type DWORD32 u32
+type PDWORD32 DWORD32*
+
+// A 64-bit unsigned integer.
+type DWORD64 u64
+type PDWORD64 DWORD64*
+
+// A floating-point variable.
+type FLOAT f32
+type FLOAT64 f64
+type PFLOAT FLOAT*
+
+// A 32-bit signed integer. The range is 2147483648 through 2147483647 decimal.
+type LONG i32
+type LONG_PTR LONG*
+type LPLONG LONG*
+
+// A 64-bit signed integer. The range is 9223372036854775808 through 9223372036854775807 decimal.
+type LONGLONG i64
+type LONG32 i32
+type LONG64 i64 
+
+// A pointer to a BOOL.
+type LPBOOL BOOL*
+
+// A pointer to a BYTE.
+type LPBYTE BYTE*
+
+// An 8-bit Windows (ANSI) character. For more information, see Character Sets Used By Fonts.
+type LPCSTR CHAR*
+
+// A 16-bit Unicode character. For more information, see Character Sets Used By Fonts.
+type LPWSTR WCHAR*
+
+// A pointer to an CHAR.
+type PCHAR CHAR*
+
+// A pointer to an BYTE.
+type PBYTE BYTE*
+
+//
+// Descriptor
+//
+
+// A handle to an object.
+type HANDLE C.HANDLE // voidptr?
+
+// A pointer to a HANDLE.
+type PHANDLE *HANDLE
+
+// A handle to a registry key.
+type HKEY HANDLE
+
+// A pointer to a HKEY.
+type PHKEY *HKEY