The following table provides a list of function calls and messages that required implementation changes in the Win32 API.
| Element | Support | Win32 API Comment |
| AccessResource | Dropped | No equivalent. |
| AllocDSToCSAlias | Dropped | No equivalent. |
| AllocResource | Dropped | No equivalent. |
| AllocSelector | Dropped | No equivalent. |
| ChangeSelector | Dropped | No equivalent. |
| CloseSound | Dropped | Replaced by multimedia sound support. |
| CountVoiceNotes | Dropped | Replaced by multimedia sound support. |
| DefineHandleTable | Dropped | No equivalent. |
| DeviceMode | Dropped | Replaced by portable DocumentProperties. |
| DlgDirSelect | Dropped | Replaced by portable DlgDirSelectEx. |
| DlgDirSelectComboBox | Dropped | Replaced by portable DlgDirSelectComboBoxEx. |
| DOS3Call | Dropped | Replaced by named, portable function. |
| ExtDeviceMode | Dropped | Replaced by portable DocumentProperties. |
| FlushComm | Dropped | Replaced by PurgeComm. |
| FreeSelector | Dropped | No equivalent. |
| GetAspectRatioFilter | Dropped | Replaced by portable GetAspectRatioFilterEx. |
| GetBitmapDimension | Dropped | Replaced by portable GetBitmapDimensionEx. |
| GetBrushOrg | Dropped | Replaced by portable GetBrushOrgEx. |
| GetCodeHandle | Dropped | No equivalent. |
| GetCodeInfo | Dropped | No equivalent. |
| GetCommError | Dropped | Replaced by GetCommState. |
| GetCurrentPDB | Dropped | No equivalent. |
| GetCurrentPosition | Dropped | Replaced by portable GetCurrentPositionEx. |
| GetDCOrg | Dropped | Replaced by portable GetDCOrgEx. |
| GetDOSEnvironment | Dropped | No equivalent. |
| GetEnvironment | Dropped | No equivalent. |
| GetFreeSpace | Dropped | Replaced by GlobalMemoryStatus. |
| GetFreeSystemResources | Dropped | Replaced by GlobalMemoryStatus. |
| GetInstanceData | Dropped | No equivalent; use alternative supported IPC mechanism. |
| GetKBCodePage | Dropped | No function equivalent. |
| GetMetaFileBits | Dropped | Replaced by portable GetEnhMetaFileBits. |
| GetSystemDebugState | Dropped | No function equivalent. |
| GetTempDrive | Dropped | Replaced by portable GetTempPath. |
| GetTextExtent | Dropped | Replaced by portable GetTextExtentPoint32. |
| GetTextExtentEx | Dropped | Replaced by portable GetTextExtentExPoint. |
| GetThresholdEvent | Dropped | Replaced by multimedia sound support. |
| GetThresholdStatus | Dropped | Replaced by multimedia sound support. |
| GetViewportExt | Dropped | Replaced by portable GetViewportExtEx. |
| GetViewportOrg | Dropped | Replaced by portable GetViewportOrgEx. |
| GetWindowExt | Dropped | Replaced by portable GetWindowExtEx. |
| GetWindowOrg | Dropped | Replaced by portable GetWindowOrgEx. |
| GetWinFlags | Dropped | No equivalent. |
| GlobalCompact | Dropped | No equivalent. |
| GlobalDosAlloc | Dropped | No equivalent. |
| GlobalDosFree | Dropped | No equivalent. |
| GlobalFix | Dropped | No equivalent. |
| GlobalLRUNewest | Dropped | No equivalent. |
| GlobalLRUOldest | Dropped | No equivalent. |
| GlobalNotify | Dropped | No equivalent. |
| GlobalPageLock | Dropped | No equivalent. |
| GlobalPageUnlock | Dropped | No equivalent. |
| GlobalUnfix | Dropped | No equivalent. |
| GlobalUnwire | Dropped | No equivalent. |
| GlobalWire | Dropped | No equivalent. |
| IsGDIObject | Dropped | No equivalent. |
| LimitEmsPages | Dropped | No equivalent. |
| LocalCompact | Dropped | No equivalent. |
| LocalInit | Dropped | No equivalent. |
| LocalNotify | Dropped | No equivalent. |
| LocalShrink | Dropped | No equivalent. |
| LockInput | Dropped | No equivalent. |
| LockSegment | Dropped | No equivalent. |
| MoveTo | Dropped | Replaced by portable MoveToEx. |
| NetBIOSCall | Dropped | Replaced by named, portable function. |
| OffsetViewportOrg | Dropped | Replaced by portable OffsetViewportOrgEx. |
| OffsetWindowOrg | Dropped | Replaced by portable OffsetWindowOrgEx. |
| OpenComm | Dropped | Replaced by CreateFile. |
| OpenSound | Dropped | Replaced by multimedia sound support. |
| ProfClear | Dropped | Replaced by profile-string function. |
| ProfFinish | Dropped | Replaced by profile-string function. |
| ProfFlush | Dropped | Replaced by profile-string function. |
| ProfInsChk | Dropped | Replaced by profile-string function. |
| ProfSampRate | Dropped | Replaced by profile-string function. |
| ProfSetup | Dropped | Replaced by profile-string function. |
| ProfStart | Dropped | Replaced by profile-string function. |
| ProfStop | Dropped | Replaced by profile-string function. |
| ReadComm | Dropped | Replaced by ReadFile. |
| ScaleViewportExt | Dropped | Replaced by portable ScaleViewportExtEx. |
| ScaleWindowExt | Dropped | Replaced by portable ScaleWindowExtEx. |
| SetBitmapDimension | Dropped | Replaced by portable SetBitmapDimensionEx. |
| SetCommEventMask | Dropped | Replaced by SetCommMask. |
| SetEnvironment | Dropped | No equivalent. |
| SetMetaFileBits | Dropped | Replaced by portable SetEnhMetaFileBits. |
| SetResourceHandler | Dropped | No equivalent. |
| SetSoundNoise | Dropped | Replaced by multimedia sound support. |
| SetSwapAreaSize | Dropped | No equivalent. |
| SetViewportExt | Dropped | Replaced by portable SetViewportExtEx. |
| SetViewportOrg | Dropped | Replaced by portable SetViewportOrgEx. |
| SetVoiceAccent | Dropped | Replaced by multimedia sound support. |
| SetVoiceEnvelope | Dropped | Replaced by multimedia sound support. |
| SetVoiceNote | Dropped | Replaced by multimedia sound support. |
| SetVoiceQueueSize | Dropped | Replaced by multimedia sound support. |
| SetVoiceSound | Dropped | Replaced by multimedia sound support. |
| SetVoiceThreshold | Dropped | Replaced by multimedia sound support. |
| SetWindowExt | Dropped | Replaced by portable SetWindowExtEx. |
| SetWindowOrg | Dropped | Replaced by portable SetWindowOrgEx. |
| StartSound | Dropped | Replaced by multimedia sound support. |
| StopSound | Dropped | Replaced by multimedia sound support. |
| SwitchStackBack | Dropped | No equivalent. |
| SwitchStackTo | Dropped | No equivalent. |
| SyncAllVoices | Dropped | Replaced by multimedia sound support. |
| UngetCommChar | Dropped | No equivalent. |
| UnlockSegment | Dropped | No equivalent. |
| ValidateCodeSegments | Dropped | No equivalent. |
| ValidateFreeSpaces | Dropped | No equivalent. |
| WaitSoundState | Dropped | Replaced by multimedia sound support. |
| WriteComm | Dropped | Replaced by WriteFile. |
| WM_CTLCOLOR | Dropped | Replaced by WM_CTLCOLOR<type> messages. |
| GCW_HCURSOR | Dropped | Replaced by GCL_HCURSOR. |
| GCW_HBRBACKGROUND | Dropped | Replaced by GCL_HBRBACKGROUND. |
| GCW_HICON | Dropped | Replaced by GCL_HICON. |
| GWW_HINSTANCE | Dropped | Replaced by GWL_HINSTANCE. |
| GWW_HWNDPARENT | Dropped | Replaced by GWL_HWNDPARENT. |
| GWW_ID | Dropped | Replaced by GWL_ID. |
| GWW_USERDATA | Dropped | Replaced by GWL_USERDATA. |
| READ | Dropped | Replaced by OF_READ. |
| WRITE | Dropped | Replaced by OF_WRITE. |
| READ_WRITE | Dropped | Replaced by OF_READ_WRITE. |
| MAKEPOINT | Dropped | Replaced by LONG2POINT. |