It is possible that if you are linking to an html file rather than building one as a web resource that you could set up the site managemer in Dreamweaver to handle this. I didn't answer the question the first time with this in mind!
You would have to have rights to
upload into your course folder on the moodle server.
You can certainly
ftp files to the proper location if you have determined the path and you know the course id number. If you don't change the file names, but simply upload a new copy, I would think that the link would continue to work just fine.
If you added a new file, then you would also have to build a link to it in Moodle by choosing resources, and link to file. The file would already be there if you had uploaded it with some ftp client.
So there are two ways:
1) copy and paste into the web page resource. Changes would have to be copied and pasted again and
2) Upload the file into the course files area and link to it. If the same file changed, then upload a new copy and the link would already be in place. If a new file is added, then you would make a link to it with the link to file resource after the fact. Or, use your DW site manager to directly edit the server side. I rarely do that, being a big chicken!, but it is certainly possible.
Hope that made a bit of sense...They are really two different types of resources and you will have to figure out which one meets your need best!
atw