Just add a namespace in your framework 1.1 dll and you will be able to reference it in visual studio 2005 or VWD

Thanks for your reply but the dll is a 3. party dll which I have no way to alter.

Ups - this was supposed to be the answer:

This was the final response from Microsoft to the question - although not that saticfactory:

Yes, unfortunately if you do not own the assembly, you cannot just use sgen.exe.
We did not port full pre-generation feature to V1.1, the way it works in V1.1 is the type explicitly points to serializer to use, so even if you generate the newer version of the serializer, the old one will be used, because it is explicitly chosen by the type.

I am afraid that you only options are
1. ask for a fix from the vendor: they either have to use V2 framework to re-generate the seriliazation codo, or just edit the V1.1 code to remove the synchronization.
2. push for QFE from Microsoft.

Thanks,
Elena