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Editorial Team
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Asked: 2026-05-25T00:28:17+00:00

Moving a working C# project from a 64-bit Windows 7 machine to a 32-bit

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Moving a working C# project from a 64-bit Windows 7 machine to a 32-bit XP machine caused the following error:

Retrieving the COM class factory for component with CLSID {681EF637-F129-4AE9-94BB-618937E3F6B6} failed due to the following error: 80040154.

681EF637-F129-4AE9-94BB-618937E3F6B6 is not in the registry so it is not properly installed, but this is same ID that was previously a problem on the 64-bit Windows 7 machine.

The solution to this error on the 64-bit Windows 7 machine was found here (change Platform Target to x86) but this does not solve the problem on the 32-bit XP machine.

How do I find the DLL associated with 681EF637-F129-4AE9-94BB-618937E3F6B6, or, even better, how do I repair this exception?

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1 Answer

  1. Editorial Team

    To find the DLL, go to your 64-bit machine and open the registry. Find the key called HKEY_CLASSES_ROOT\CLSID\{681EF637-F129-4AE9-94BB-618937E3F6B6}\InprocServer32. This key will have the filename of the DLL as its default value.

    If you solved the problem on your 64-bit machine by recompiling your project for x86, then you’ll need to look in the 32-bit portion of the registry instead of in the normal place. This is HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Classes\CLSID\{681EF637-F129-4AE9-94BB-618937E3F6B6}\InprocServer32.

    If the DLL is built for 32 bits then you can use it directly on your 32-bit machine. If it’s built for 64 bits then you’ll have to contact the vendor and get a 32-bit version from them.

    When you have the DLL, register it by running c:\windows\system32\regsvr32.exe.

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