i used to save a file in my own format and extension.
-Can you tell me, please, how can i associate the extension with my Application?
-How do i need to change the Code so that when the User double clicks the file, it launches my App and my App starts parsing the File?
Thanks in advance.
Enter regedit, go to HKEY_CLASSES_ROOT. Add/edit the keys here to change associations. It's usually some path under shell/shellex.
Use the table of contents tree on the left in order to read all the documentation on it.