Troubleshooting RegPkg Package Registration
To register a package by using RegPkg in Visual Studio 2008, you must use the version of RegPkg that is appropriate for your package.
RegPkg Versions Related to Package Versions
There are two versions of RegPkg. One version is included in Visual Studio 2008. Use this version to register packages that have been built by using the Visual Studio 2008 Microsoft.VisualStudioShell.9.0.dll assembly. This version cannot register packages that have been built by using the earlier Microsoft.VisualStudio.Shell.dll assembly.
The other, earlier version of RegPkg can register packages that have been built by using the Microsoft.VisualStudio.Shell.dll assembly. However, it cannot register packages built by using the Visual Studio 2008 Microsoft.VisualStudio.Shell.9.0.dll assembly.