[CentOS] Cups updates - overwriting mime.* files

Every time cups is updated I have to check mime.convs and mime.types to
ensure that references to handling raw file types are uncommented otherwise
we notice that one of our printers stops working because the files are
overwritten by the updates. Should config files not be left untouched?

We do have 'print command = lpr -r -oraw -P %p %s' in smb.conf but this on
its own didn't make the printer work.

Do I just need to keep checking or is there a better way

Oh, Centos 3.4, by the way!

Thanks

Nigel Kendrick