diff --git a/rtl/win16/win31.pp b/rtl/win16/win31.pp
index ea52e2bb8e..381bbe4229 100644
--- a/rtl/win16/win31.pp
+++ b/rtl/win16/win31.pp
@@ -235,6 +235,25 @@ function SetBoundsRect(hDC: HDC; const lprcBounds: RECT; flags: UINT): UINT; ext
 function GetBoundsRect(hDC: HDC; var lprcBounds: RECT; flags: UINT): UINT; external 'GDI';
 {$endif}
 
+{ Coordinate transformation support }
+function SetWindowOrgEx(hdc: HDC; nX, nY: SmallInt; lpPoint: LPPOINT): BOOL; external 'GDI';
+function GetWindowOrgEx(hdc: HDC; lpPoint: LPPOINT): BOOL; external 'GDI';
+
+function SetWindowExtEx(hdc: HDC; nX, nY: SmallInt; lpSize: LPSIZE): BOOL; external 'GDI';
+function GetWindowExtEx(hdc: HDC; lpSize: LPSIZE): BOOL; external 'GDI';
+
+function OffsetWindowOrgEx(hdc: HDC; nX, nY: SmallInt; lpPoint: LPPOINT): BOOL; external 'GDI';
+function ScaleWindowExtEx(hdc: HDC; nXnum, nXdenom, nYnum, nYdenom: SmallInt; lpSize: LPSIZE): BOOL; external 'GDI';
+
+function SetViewportExtEx(hdc: HDC; nX, nY: SmallInt; lpSize: LPSIZE): BOOL; external 'GDI';
+function GetViewportExtEx(hdc: HDC; lpSize: LPSIZE): BOOL; external 'GDI';
+
+function SetViewportOrgEx(hdc: HDC; nX, nY: SmallInt; lpPoint: LPPOINT): BOOL; external 'GDI';
+function GetViewportOrgEx(hdc: HDC; lpPoint: LPPOINT): BOOL; external 'GDI';
+
+function OffsetViewportOrgEx(hdc: HDC; nX, nY: SmallInt; lpPoint: LPPOINT): BOOL; external 'GDI';
+function ScaleViewportExtEx(hdc: HDC; nXnum, nXdenom, nYnum, nYdenom: SmallInt; lpSize: LPSIZE): BOOL; external 'GDI';
+
 implementation
 
 end.
diff --git a/rtl/win16/winprocsh.inc b/rtl/win16/winprocsh.inc
index d71a5d5444..e7c78ac477 100644
--- a/rtl/win16/winprocsh.inc
+++ b/rtl/win16/winprocsh.inc
@@ -310,3 +310,33 @@ function MulDiv(nMultiplicand, nMultiplier, nDivisor: SmallInt): SmallInt; exter
 { Device Capabilities }
 
 function GetDeviceCaps(hdc: HDC; iCapability: SmallInt): SmallInt; external 'GDI';
+
+{ Coordinate transformation support }
+
+function SetMapMode(hdc: HDC; fnMapMode: SmallInt): SmallInt; external 'GDI';
+function GetMapMode(hdc: HDC): SmallInt; external 'GDI';
+
+function SetWindowOrg(hdc: HDC; nXOrigin, nYOrigin: SmallInt): DWORD; external 'GDI';
+function GetWindowOrg(hdc: HDC): DWORD; external 'GDI';
+
+function SetWindowExt(hdc: HDC; nXExtent, nYExtent: SmallInt): DWORD; external 'GDI';
+function GetWindowExt(hdc: HDC): DWORD; external 'GDI';
+
+function OffsetWindowOrg(hdc: HDC; nXOffset, nYOffset: SmallInt): DWORD; external 'GDI';
+function ScaleWindowExt(hdc: HDC; nXNum, nXDenom, nYNum, nYDenom: SmallInt): DWORD; external 'GDI';
+
+function SetViewportOrg(hdc: HDC; nXOrigin, nYOrigin: SmallInt): DWORD; external 'GDI';
+function GetViewportOrg(hdc: HDC): DWORD; external 'GDI';
+
+function SetViewportExt(hdc: HDC; nXExtent, nYExtent: SmallInt): DWORD; external 'GDI';
+function GetViewportExt(hdc: HDC): DWORD; external 'GDI';
+
+function OffsetViewportOrg(hdc: HDC; nXOffset, nYOffset: SmallInt): DWORD; external 'GDI';
+function ScaleViewportExt(hdc: HDC; nXNum, nXDenom, nYNum, nYDenom: SmallInt): DWORD; external 'GDI';
+
+function DPtoLP(hdc: HDC; lppt: LPPOINT; cPoints: SmallInt): BOOL; external 'GDI';
+function LPtoDP(hdc: HDC; lppt: LPPOINT; cPoints: SmallInt): BOOL; external 'GDI';
+{$ifdef VAR_PARAMS_ARE_FAR}
+function DPtoLP(hdc: HDC; var pt; cPoints: SmallInt): BOOL; external 'GDI';
+function LPtoDP(hdc: HDC; var pt; cPoints: SmallInt): BOOL; external 'GDI';
+{$endif}
diff --git a/rtl/win16/wintypes.inc b/rtl/win16/wintypes.inc
index b4a4aaa89c..f61b0b4ea2 100644
--- a/rtl/win16/wintypes.inc
+++ b/rtl/win16/wintypes.inc
@@ -485,3 +485,19 @@ const
   RC_STRETCHDIB       = $2000;
   RC_OP_DX_OUTPUT     = $4000;
   RC_DEVBITS          = $8000;
+
+{ Coordinate transformation support }
+
+{ Map modes }
+  MM_TEXT        = 1;
+  MM_LOMETRIC    = 2;
+  MM_HIMETRIC    = 3;
+  MM_LOENGLISH   = 4;
+  MM_HIENGLISH   = 5;
+  MM_TWIPS       = 6;
+  MM_ISOTROPIC   = 7;
+  MM_ANISOTROPIC = 8;
+
+{ Coordinate Modes }
+  ABSOLUTE = 1;
+  RELATIVE = 2;