How to open a custom file extension with a pre-specified form in VB.NET project

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VB

Hey fella's. I wish to ask for some advise on how to solve a problem that's been bugging me for 2 days now. Here's the details:

1. My project creates a customized text file that is saved automatically with an ".mssx" (e.g. Filename.mssx) file extension. This is encrypted so as to ensure security of the file contents.

2. The file will be sent to the client version of my project. I created a form that will parse the contents of that file from the clients end.

3. Instead of loading the file into my application thru browsing via OpenFileDialog, I wish for my application to directly launch and parse the file straight into the form I created for such purpose when the .mssx file is double clicked.

Any ideas and known resource that can help me point out to the right direction would be very much appreciated. Many thanks in advance and keep coding! :)

What I have tried:

> Tried to tinker with window's Registry and successfully created a custom icon for the .mssx file.

> I think the trick to achieving what I want to do lies in configuring the registry.