newbie question

[Guest]

I am working with a content management system. Since I am pretty proficient with HTML and style sheets I asked the developer if I could have access to the orginal templates and files so I could modify it for specific purposes. He sent me all the files and I opened them in Dreamweaver hoping I could edit them there.  I open the .aspx and .vb files but don't see anything there that looks remotely like I could work with. I am attaching a screenshot of a partial menu of files. Is it possible to work with these files and if so where do I start?

[jon8]

that site looks to be built in visual studio using VB.NET, and the philosiphy of .NET developers is to separate UI from and applications, and since there are skins, they may have used something else in the development as well.