PRB: "Unrecoverable build error" error message when you build Setup and Deployment projects

• In the Visual Studio .NET development environment, you have multiple open windows.
• In your Visual Studio .NET project, multiple folders have the same name.
• Some interface registrations are missing from the registry.
• In the registry, Mergemod.dll is not registered or an incomplete version of Mergemod.dll is registered.
• You have upgraded from the Beta 2 version of Visual Studio .NET to the release version.

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• Too many code and design windows open
  To resolve this problem, close any start, code, or design windows that are not being used from within the Visual Studio .NET interactive development environment (IDE). These windows are accessed by tabs or by MDI type in the work area of the IDE.
• Multiple folders have the same name
  To resolve this problem, assign a unique name to each folder in the Visual Studio .NET project.
• Missing registrations
  Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
  322756  (http://support.microsoft.com/kb/322756/ ) How to back up and restore the registry in Windows
  
  
  To resolve this problem, import or manually add the missing information to the registry. To do this, follow these steps:
  1. Click Start, and then click Run. In the Open text box, type regedit, and then click OK to start Registry Editor.
  2. Add the following registry keys:
     • HKEY_CLASSES_ROOT\Interface\{00020404-0000-0000-C000-000000000046}
       
       Set the Default value of this key to IEnumVARIANT
     • HKEY_CLASSES_ROOT\Interface\{00020404-0000-0000-C000-000000000046}\NumMethods
       
       Set the Default value of this key to 7
     • HKEY_CLASSES_ROOT\Interface\{00020404-0000-0000-C000-000000000046}\ProxyStubClsid
       
       Set the Default value of this key to {00020421-0000-0000-C000-000000000046}
     • HKEY_CLASSES_ROOT\Interface\{00020404-0000-0000-C000-000000000046}\ProxyStubClsid32
       
       Set the Default value of this key to {00020421-0000-0000-C000-000000000046}
• Mergemod.dll is not registered correctly
  To resolve this problem, register Mergemod.dll again. Typically, Mergemod.dll is located in the following folder:
  C:\Program Files\Common Files\Microsoft Shared\MSI Tools\Mergemod.dll
  To register the Mergemod.dll, type the following command at a command prompt, and then press ENTER:
  regsvr32 "C:\Program Files\Common Files\Microsoft Shared\MSI Tools\mergemod.dll"
• Upgrade from the Beta 2 version of Visual Studio .NET
  To resolve this problem, remove the Beta 2 version of Visual Studio .NET, and then reinstall the release version. For more information about how to remove the Visual Studio .NET Beta version, click the following article number to view the article in the Microsoft Knowledge Base:
  312383  (http://support.microsoft.com/kb/312383/ ) How to remove Visual Studio .NET beta and release candidate versions

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Steps to Reproduce the Behavior

1. Click Start, and then click Run.
2. In the Open text box, type the following command, and then click OK:
   regsvr32 /u "C:\Program Files\Common Files\Microsoft Shared\MSI Tools\mergemod.dll"
3. Start Visual Studio .NET. On the File menu, point to New, and then click Project.
4. Under Project Type, click Setup and Deployment Project. Under Templates, click Setup Project. Click OK.
5. On the Build menu, click Build Solution.

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