List of limitations in 64-Bit Windows
This article was previously published under Q282423
This article lists some limitations in 64-bit Windows.
No Mixed 64-Bit/32-Bit Processes
- 64-bit programs cannot load and call 32-bit MDAC.
- 64-bit Microsoft Internet Explorer cannot load 32-bit ActiveX controls.
- The 64-bit shell cannot load 32-bit Inproc shell extensions.
- 32-bit installer programs cannot load and register 64-bit DLLs.
No 16-Bit Code
- No 16-bit code can run, except for recognized InstallShield and Acme installers (these are hard-coded in Wow64 to allow them to work).
- 16-bit Setup bootstraps are not supported.
- 16-bit MS-DOS and Microsoft Windows 3.x utilities will not start. If you attempt to start such a program, you receive a "Program.exe is not a valid Win32 application" error message.
No OS/2 or Posix Program SupportThere is no support for OS/2 or Posix programs.
No Kernel-Mode 32-Bit CodeThere is no support for Kernel-mode or 32-bit code such as:
- 32-bit virus-detection or 32-bit file system filters.
- 32-bit video adapter or 32-bit network adapter drivers.
- 32-bit Kernel-mode printer drivers.
Article ID: 282423 - Last Review: 10/11/2007 02:29:56 - Revision: 2.5
Microsoft Windows XP Professional, Microsoft Windows XP Professional x64 Edition, Microsoft Windows Server 2003 Service Pack 1
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