I'm working on a Visual Studio Add-in to edit files in SharePoint. From this Add-in I would like to be able to open SharePoint Designer with a specific SharePoint site. Finding the application is no problem, its folder is in registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\12.0\SharePoint Designer\InstallRoot, and the application is called SPDesign.exe.
I could only find a command-line switch to open a page (see http://office.microsoft.com/en-us/sharepointdesigner/HA101487151033.aspx), not to open a site.
If I open a page like spdesign.exe /n http://myserver/pages/default.aspx, the page is opened with a name Untitled_1.aspx, and at the left side you don't see the site explorer.
Any ideas on how to automate the opening of a site, and if possible also the opening of a page in the site, with the site navigator on the left side and the actual page opened.