If you open a .NET Solution file and get the "not a valid solution" message, it's likely that it was created in VS 2003 and you are trying to open it with VS 2002. To work around the problem, just do this:
1) Go into the solution file in a text editor and replace the line:
Microsoft Visual Studio Solution File, Format Version 8.00
with
Microsoft Visual Studio Solution File, Format Version 7.00
2) Go into each project file in a text editor and replace the lines:
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