I have the same setup on two PCs. I simply copied the directory, which contains my .SLN file, for a Web site. The Web site is local. But, when on the 2nd PC, if I try to open the .SLN file, it keeps complaining:

The applicaton for project 'http://localhost/Level Extreme' is not installed.
Make sure the application for the project type () is installed.

How can I succeed to establish that project working with my existing site?