Hi all, I have a whole hierarchy of classes that is serialized without problem using XML archive. When I wanted to use binary archive (that should be faster and smaller), i met an little problem. A bit of history, to make it easier to spot related changes in class versions, we decided not to go with serial class version numbers (1, 2, 3...) but with meaningful version numbers: internal branch number + date. We end up with class versions like 420100714 or 520101102. In XML or text, no problem at all. In binary, it took me a while to find out that class version numbers are serialized as unsigned char! However, the documentation here <http://www.boost.org/doc/libs/1_44_0/libs/serialization/doc/archive_referen ce.html> says unsigned int. It is a bit surprising, since the type passed to the serialization method is int. I understand that I need to create my own binary archive to implement save_override and load_override for version_type. However, doing the override means that i am preventing the use of standard boost binary archive. Is that a known bug, or is it even considered a bug? Thanks -- Guy Prémont, D.Sc. Architecte logiciel senior / Senior software architect CM Labs Simulations Inc. <blocked::http://www.cm-labs.com/> http://www.cm-labs.com/ Tel. 514-287-1166 ext. 237