V9.2 introduced a modified version of the FAIRCOM.FCS user definitions. As a result, prior client server compatibility can be affected.
If a client prior to c-treeACE V9.2 tries to open the file FAIRCOM.FCS!USER.dat with a c-treeACE Server with an updated FC_USER structure, the open will fail with error UVRC_ERR (859, The client’s structure definition for the file FAIRCOM.FCS!USER.dat is out of date. Update your client library.)
If a V9.2 or later client with with an updated FC_USER structure attempts to open the file FAIRCOM.FCS!USER.dat using a c-treeACE Server without the updated structure, the open will fail with error UVRS_ERR (860, The server’s structure definition for the file FAIRCOM.FCS!USER.dat is out of date. Update your c-treeACE Server.)