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    <p><strong>FIRST</strong>, you need to set up file association, so that your file type is associated with your application and opening the file type will run your application.</p> <p>You can do the file association programatically, there is some detail here as mentioned: <a href="http://www.codeproject.com/KB/dotnet/System_File_Association.aspx" rel="nofollow noreferrer">http://www.codeproject.com/KB/dotnet/System_File_Association.aspx</a></p> <p>You can also do it via your Setup project for you application if you have one. This is an <strong>easier</strong> path for "newbies". Details for using visual studio to get the setup project to add the file association and also set the icon for the file are here: <a href="http://www.dreamincode.net/forums/topic/58005-file-associations-in-visual-studio/" rel="nofollow noreferrer">http://www.dreamincode.net/forums/topic/58005-file-associations-in-visual-studio/</a></p> <p>Otherwise if you use InnoSetup, Wix etc then I suppose you could just see instructions for those installers to create the association for you.</p> <p><strong>SECOND</strong>, you need to have your application accept command line arguments. The opened file(s) is(are) passed as a command line argument(s). You need to process the arguments to get the file path/name(s) and open the given file(s). There is a nice description of this here with code: <a href="https://stackoverflow.com/questions/728317/c-command-line-arguments-problem-in-release-build/730545#730545">C# Command Line arguments problem in Release build</a></p> <p>In your case, rather than <code>MessageBox.Show(s)</code> in the form shown handler, you would call your bespoke argument parsing method. For a simple application which only accepts files names to open as arguments, this could be as simple as</p> <pre><code>foreach (string filePathName in Args) DoNamedFileOpen(filePathName); </code></pre> <p>Your code can also have a method that might extract from the file the values for the datafields you are interested in etc.</p> <p>This is a nice simple approach to the issue of have file associations set on installation of your application, with icons, and having your application handle the opening of those files. </p> <p>Of course, there are plenty of other options, like run-time file association (asking the user if they want the association), detecting "broken" associations, etc.</p> <p>This question is a long time here but I hope this is useful for new searches</p>
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