Dreamweaver can´t do this, as it works with real files
and not "alias" -- something like this needs to be done by the
server, e.g. your local and remote Apache server may
(or may not, depends on the configuration provided by the server
admin) have a "rewrite engine" module (
mod rewrite)
installed, which could be configured to do what you want.
It´s a tricky thing though, and an easier option were to
place your e.g. current "dynamic.html" in a subdirectory named
"dynamic" and rename the file to "index.html" -- the reason behind
this approach is: servers are usually configured to automatically
load an existing "index.htm(l)" file from whatever directory in
case no file name has been supplied, means linking to
"www.predictum.com/dynamic" would load this file.