There should only be the MSVC 6 project files with the stuff from the SVN. There is the "project" file (.dsp), and the "workspace" file (.dsw). Normally, you open the workspace file. A workspace can contain multiple projects. It is the equivalent of a "solution" in VS2008 I believe.
I guess try opening the .dsw file, and see if you have better luck. If that doesn't work, try converting to VS2008 format first, and then from VS2008 to VS2010 and see what happens. I'll maybe try downloading VS2010 this weekend if you still can't get things working. (No promises though).
I don't much understand Sirbomber's question either.