Microsoft KB Archive/169582

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INFO: WIN31COMPAT Flag Allows Compatible Win3.1, Win95 VxDs


The information in this article applies to:

  • Microsoft Win32 Device Driver Kit (DDK) Windows 95


By using the WIN31COMPAT flag, you can build a VxD that is binary compatible between Windows 3.1 and Windows 95. A number of DDK header files check for this flag because certain functionality is new for Windows 95 and would not work under Windows 3.1.


You can define this flag in your header file:

   #define WIN31COMPAT 

Alternately, you can pass the flag to the assembler in the makefile, using -DWIN31COMPAT. For example, in the Windows 95 DDK under \ddk\base\samples\generic, the makefile contains the line:

   AFLAGS = -coff -DBLD_COFF -DIS_32 -W2 -c -Cx -Zm -DMASM6 $(DDEBUG) 

You can simply insert -DWIN31COMPAT on this line.

To ensure binary compatibility in your VxD between Windows 3.1 and Windows 95, you must not call services that are new for Windows 95.

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Technology : kbAudDeveloper kbWin95search kbWinDDKSearch kbWin32sSearch kbWin32DDK95 kbWin32DDKSearch

Last Reviewed: March 6, 1999
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