Error 80040154 when trying to use SourceSafe via interop on 64bit Windows

win64 80040154 {783cd4e4-9d54-11cf-b8ee-00608cc9a71f} interop com sourcesafe 9 Comments

We recently moved to Windows 7, and I decided to go with the 64bit version for my machine. One of the utilities we use is a small tool for adding folders to Visual SourceSafe (why we haven't moved to another SCC provider yet is another question!) via the SourceSafeTypeLib interop dll. However, I was most annoyed when it wouldn't work on my machine, the following exception message would be displayed:

Retrieving the COM class factory for component with CLSID {783CD4E4-9D54-11CF-B8EE-00608CC9A71F} failed due to the following error: 80040154.

By default, .NET applications run using the CLR that matches your operating system, ie x64 on Windows 64bit, and x86 on Windows 32bit. I found that if I change the platform target from Any CPU to x86 (you can find this on the Build tab of your project's properties) to force it to use the 32bit CLR, then the interop would succeed and the utility would work again.

Hopefully this will be of use for the next person with this problem. Meanwhile I'm still thinking about a new SCC provider :)