stdole 7.0.3300.0

When I first got this error during the initialization phase of my component:

Could not load file or assembly 'stdole, Version=7.0.3300.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

I thought that it wanted Interop.stdole.dll, which was sitting right there in the working directory. But as it turned out, it meant the Primary Interop Assembly called stdole.dll, which was indeed missing.  Duh!