Using the Windows Explorer, right click on a solution file (or project,
etc.), click Open With, select the VS.NET 2003 and set it by default with
the checkbox.

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Best regards,
Carlos J. Quintero
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>I started with .NET 2003 and installed an 2005 Visual C++ express
> edition. After uninstalled the express edition, all my file
> associations for .NET 2003 are completely nuked. Is there any solution
> short of reinstalling?