.net - C#: How to know whether certain Office 2003 or 2007 application is installed?

Question

I need to know whether Microsoft Word, Excel, Outlook, Project, etc are installed in a Windows Forms .net 2.0 C# application.
The first attempt was by simply trying to create the application objects and catching any exception, but this is too time consuming.
Is there any faster way to detect this? Like checking registry values, or another technique with the COM wrappers?

Answer 1

This should work, as described here. It's not a very elegant solution, though, as it is version specific and will break with the next office version. This example is forOffice 2003, so it won't work with Office 2007 without updating.

const string ASSEMBLY2003 = "Microsoft.Office.Interop.Excel, Version=11.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c";  

static bool IsAssemblyInstalled(string assembly)  
{  
   try 
   {  
       s_assemblyExcel = Assembly.Load(assembly);  
       return true;  
   }   
   catch 
   {  
       return false;  
   }  
}