Working with .vm files and where to make changes

I have inherited a website that I have been told was created in .asp. There are no .html files; everything is a .vm file. I can open these and poke around a bit, but they are clearly created in a different manner than I know. The directory structure of the site is different than what I am accustomed to as well.

I need to edit a few items on a page:

http://www.barkercompany.com/page/item.barker?id=sales

…and I cannot find any file that contains the information I need to edit! I tried a search with no result. I have manually opened every file that looks even remotely promising, with no luck. Please somebody help!

thanks in advance!