PRB: Regsvr32.exe Fails in Mfco42d.dll Registering MFC Server

ID: Q192535

The information in this article applies to:

The Microsoft Foundation Classes (MFC), included with:
- Microsoft Visual C++, 32-bit Editions, versions 5.0, 6.0

SYMPTOMS

Regsvr32 may fail when registering a debug build of an MFC Server. The error message box may contain the following message:

The ordinal 3300 could not be located in the dynamic link library
MFCO42D.DLL.

The ordinal number may vary.

If you click OK, another error message may appear stating:

RegSvr32: LoadLibrary("<server name>") failed.
GetLastError returns 0x000000b6.

CAUSE

The error occurs because the Debug MFC DLL's are not binary-compatible between Visual C++ 5.0 and Visual C++ 6.0. If the user has written a debug build DLL in Visual C++ 5.0 and attempts to register it on a machine that has Visual C++ 6.0, then the error will appear.

RESOLUTION

The following are three possible workarounds:

Build a release version of the server in Visual C++ 5.0 and run it on the target Visual C++ 6.0 machine.

Rebuild the Server using Visual C++ 6.0.

Copy the MFC debug DLLs from VC++ 5.0 to the same directory on the target machine as the MFC ActiveX server (for diagnostic purposes only because redistribution violates the Visual C++ license agreement).

STATUS

This behavior is by design.

REFERENCES

For additional information, please see the following article(s) in the Microsoft Knowledge Base:

Q190487 PRB: MFC Debug DLLs Are Not Compatible Between Versions

Additional query words: 3304

Keywords : kbole kbDebug kbMFC kbVC500 kbVC600
Version : WINNT:5.0,6.0
Platform : winnt
Issue type : kbprb