Hi Michel,

It may not be considered the same assembly by CLR.
Each assembly has a four-part name consisting of the following elements:
friendly name, version number, culture setting, and public key (or public
key token).
http://msdn.microsoft.com/msdnmag/issues/03/08/BasicInstincts/  has some
explanation.

The Global Assembly Cache tool can help remove reference or assembly from
your GAC.
see
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cptools/htm
l/cpgrfglobalassemblycacheutilitygacutilexe.asp for details.

Thanks

Jason

--------------------