I use the multi-file find and replace tool in the toolbox. If
you are using RH 7 and do not see the tools tab, you will have to
choose View>Pods>Toolbox to see this one. I generally switch
the "named" file type to html since I'm usually concerned w/ the
body of a topic.
Warning: If you work with multiple projects, be sure to
update the "Where" path because it always uses the previous path
that this feature was used.