Open,Save Projects in C#

Hello,
I have a couple of Questions about Opening projects..I'm using Project 2003
1. Is there a way to open MS Project Pro in C# without giving any
filename..? I'm able to open a project like this
System.Diagnostics.Process.Start("C:\\Project1.mpp");
But I'd want to just start the MS Project without giving any filename.

2. I know I can save projects in a macro in MS project like this
FileSave
But how do I save the project from C#..? I have added Project as a reference
to my code. But I do...

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