I have 12.1.0.2 installed (full installation) and both files are present. David Fitzjarrell Principal author, "Oracle Exadata Survival Guide" On Saturday, November 1, 2014 7:40 PM, Jared Still <jkstill@xxxxxxxxx> wrote: Fellow Oracle-L folks: It seems that oracle has rewritten oerr for 12c, creating a shell or cmd wrapper for the perl script oerr.pl. On my 12.1 Windows client I find that it is rather useless, as the mesg files are not included in the installation. Typically Oracle has never included the mesg files with MS Windows, no idea why not. I don't really want to install a 12c full installation just to check if the mesg files exist there, so could someone that has a 12c db installation on Windows respond with information on these 2 files? OH/network/mesg/tnsus.msg OH/rdbms/mesg/oraus.msg Many thanks if someone could take a look at this. Jared Still Certifiable Oracle DBA and Part Time Perl Evangelist Principal Consultant at Pythian Pythian Blog http://www.pythian.com/blog/author/still/ Oracle Blog: http://jkstill.blogspot.com Home Page: http://jaredstill.com