I was asked to make changes to a site built with frontpage. Personally i know a little HTML and use dreamweaver to make chages to my site. i can't figure out how to get dreaweaver to open the pages. Anyone have experience with this?

Are the FrontPage Extensions turned on? If they're turned on and you open the site and change things using Dreamweaver you'll run the chance of corrupting the site entirely.

Frontpage sites should only be opened and worked-on using FrontPage unless the FrontPage Extensions are not being used.

Most likely you'll have to use FrontPage to work on the site, and since you use Dreamweaver you shouldn't have any problems using Frontpage since Frontpage is a lot easier to use.