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

How to check if MSWord 2003 0r 2007 is installed in the system using C# code?

Answer 1

This code shows that a simple registry check will do the job.

Here is the code converted to C# (and slightly improved to use a using statement).

using Microsoft.Win32;

// Check whether Microsoft Word is installed on this computer,
// by searching the HKEY_CLASSES_ROOT\Word.Application key.
using (var regWord = Registry.ClassesRoot.OpenSubKey("Word.Application"))
{
    if (regWord == null)
    {
        Console.WriteLine("Microsoft Word is not installed");
    }
    else
    {
        Console.WriteLine("Microsoft Word is installed");
    }
}

Note that it’s not good enough to check C:\Program Files\Microsoft Office\ for the msword EXE file, as the user might have installed it somewhere else.