.net - How do I launch files in C#

Question

-Edit- I feel like an idiot. I had a feeling something like the answer below would work but didn't see any google results similar to the answers below. So when I saw this complex code I thought it had to be this way.

I searched and found this Windows: List and Launch applications associated with an extension however it didn't answer my question. With tweaks below, I came up with the below. However, it gets stuck on image files. Txt files run fine

I will update this code soon to account for app paths with spaces however I don't understand why image files don't launch.

static void launchFile(string fn)
{
    //majority was taken from
    //https://stackoverflow.com/questions/24954/windows-list-and-launch-applications-associated-with-an-extension
    const string extPathTemplate = @"HKEY_CLASSES_ROOT{0}";
    const string cmdPathTemplate = @"HKEY_CLASSES_ROOT{0}shellopencommand";

    string ext = Path.GetExtension(fn);

    var extPath = string.Format(extPathTemplate, ext);

    var docName = Registry.GetValue(extPath, string.Empty, string.Empty) as string;
    if (!string.IsNullOrEmpty(docName))
    {
        // 2. Find out which command is associated with our extension
        var associatedCmdPath = string.Format(cmdPathTemplate, docName);
        var associatedCmd = Registry.GetValue(associatedCmdPath, string.Empty, string.Empty) as string;

        if (!string.IsNullOrEmpty(associatedCmd))
        {
            //Console.WriteLine(""{0}" command is associated with {1} extension", associatedCmd, ext);
            var p = new Process();
            p.StartInfo.FileName = associatedCmd.Split(' ')[0];
            string s2 = associatedCmd.Substring(p.StartInfo.FileName.Length + 1);
            s2 = s2.Replace("%1", string.Format(""{0}"", fn));
            p.StartInfo.Arguments = s2;//string.Format(""{0}"", fn);
            p.Start();
        }
    }
}

Answer 1

Use:

System.Diagnostics.Process.Start(filePath);

It will use the default program that would be opened as if you just clicked on it. Admittedly it doesn't let you choose the program that will run... but assuming that you want to mimic the behaviour that would be used if the user were to double-click on the file, this should work just fine.