| AccCtrl | Common new style Win32 Access Control unit | (Win32 only) |
| AclAPI | Acl and trusted server access control APIs interface unit | (Win32 only) |
| ActiveX | Base ActiveX and OLE 2 interface unit | (Win32 only) |
| CommCtrl | Common Controls interface unit | (Win32 only) |
| CommDlg | Common Dialog APIs interface unit | (Win32 only) |
| CompMath | Complex numbers manipulate unit | (MSDOS, OS/2, Win32) |
| Cpl | Control panel extension DLL definitions unit | (Win32 only) |
| CRT | Keyboard and monitor control routines | (MSDOS, OS/2 console, Win32 console) |
| D3D | Direct3D version 7 interface unit | (Win32 only) |
| D3D8 | Direct3D version 8 interface unit | (Win32 only) |
| D3DApp | Application object for the Direct3D samples framework library | (Win32 only) |
| D3DFile | Support code for loading DirectX (*.X) files | (Win32 only) |
| D3DFont | DirectX Texture-based font object | (Win32 only) |
| D3DRes | Resource definitions required by the CD3Dapplication object | (Win32 only) |
| D3DRM | Direct3D Retained mode interface unit | (Win32 only) |
| D3DUtil | Helper functions and typing shortcuts for Direct3D programming | (Win32 only) |
| D3DX8 | headers of helper library for 3D programming | (Win32 only) |
| Ddeml | DDEML API interface unit | (Win32 only) |
| DDraw | DirectDraw interface unit | (Win32 only) |
| Debug | Print the Run-time Error Codes | (MSDOS, OS/2, Win32) |
| DInput | DirectInput interface unit | (Win32 only) |
| Dlgs | UI dialog header information unit | (Win32 only) |
| DMusic | DirectMusic interface unit | (Win32 only) |
| Dos | Support MSDOS functions unit | (MSDOS, OS/2, Win32) |
| DosCall | DOSCALL Private Unit | (OS2 only) |
| DPlay | DirectPlay version 7 interface unit | (Win32 only) |
| DPlay8 | DirectPlay version 8 interface unit | (Win32 only) |
| DPMI | DOS Protected Mode Interface support unit | (MSDOS only) |
| DSetup | DirectXSetup interface unit | (Win32 only) |
| DShow | DirectShow interface unit | (Win32 only) |
| DSound | DirectSound interface unit | (Win32 only) |
| DX7toDX8 | DX7 to DX8 Direct3D aliases to aid porting DX7 apps to DX8 | (Win32 only) |
| DXFile | Interfaces to access Rendermorthics eXtensible file format | (Win32 only) |
| DXUtil | Helper functions and typing shortcuts for DirectX programming | (Win32 only) |
| ErrCodes | Error Codes constants | (MSDOS only) |
| FDebug | Write the Error Code to the Log file | (MSDOS, OS/2, Win32) |
| Graph | Base MSDOS Graphics unit | (MSDOS only) |
| HtmlHlp | Html Help API unit | (Win32 only) |
| ImageHlp | Image help routines | (Win32 only) |
| Imm | Input Method Manager definitions unit | (Win32 only) |
| Keyboard | Keyboard Handling unit | (MSDOS, Win32 console) |
| LM | Lan Manager interface unit | Win32 target) |
| LZExpand | Data Decompression library functions | (Win32 only) |
| MAPI | Messaging Applications Programming Interface unit | (Win32 only) |
| Math | Extended Mathematics unit | (MSDOS, OS/2, Win32) |
| Messages | Messages interface unit | (Win32 only) |
| MMedia | Multimedia Devices support unit | (Win32 only) |
| MMSystem | Multimedia interface unit | (Win32 only) |
| Mouse | Mouse Handling unit | (MSDOS, Win32 console) |
| Nb30 | NetBIOS 3.0 interface unit | (Win32 only) |
| OpenGL | OpenGL API interface unit | Win32 target) |
| OS2PMAPI | OS/2 API Interface Unit | (OS2 only) |
| OS2Ord | Ordinal values for OS/2 API Interface | (OS2 only) |
| OS2Types | Types for OS/2 API Interface | (OS2 only) |
| PenWin | Pen Windows Interface Unit | (Win32 only) |
| Printer | Printer Support unit | (MSDOS, Win32) |
| Regstr | Registry interface unit | (Win32 only) |
| RichEdit | RichEdit 2.0 control interface unit | (Win32 only) |
| ShellAPl | Shell API interface unit | (Win32 only) |
| ShlObj | Shell Objects Interface unit | (Win32 only) |
| Strings | Large Strings Manipulate unit | (MSDOS, OS/2, Win32) |
| System | Base Low Level System routines | (MSDOS, OS/2, Win32) |
| TlHelp32 | Tool help unit | (Win32 only) |
| URLMon | URL Moniker support unit | (Win32 only) |
| Use16 | Redefinition of Integer Types for 16-bit | (MSDOS, OS/2, Win32) |
| Use32 | Redefinition of Integer Types for 32-bit | (MSDOS, OS/2, Win32) |
| WinCRT | Text Screen interface unit for Win32 | (Win32 only) |
| WinDNS | Windows 32bit DNS API interface unit | (Win32 only) |
| WinDos | MS-DOS functions Emulation for OS/2 and Win32 | (MSDOS, OS/2, Win32) |
| Windows | Base Windows 32-bit API interface unit | (Win32 only) |
| WinInet | Microsoft Windows Internet Extensions API interface unit | (Win32 only) |
| WinSock | WINSOCK.DLL API interface unit | (Win32 only) |
| WinSpool | Print API interface unit | (Win32 only) |
| WinSvc | Service Control Manager unit | (Win32 only) |
| ZenTimer | Full-featured ZTimer Library unit | (MSDOS, OS/2, Win32) |
| ZMouse | IntelliMouse support interface unit | (Win32 only) |
