Hello,
Thanks for your comments I appreciate it very much. Somebody have provided me with the code to associate an extension in the registry.
Now I have some additional questions
1) How can I open multi files with the same instance of my application, instead of opening one instance for every opened file?
2) If I put the code of association extensions in the main sub, so this code will execute every time the application runs, then how can I do it to run it only one time? You said that usually the association happens at the set up of the application, how can I do it?
3) If an extension has been assigned before, so after executing the code of associate extensions, this extension remains unchangeable. How can I do to force it?
Thank you very much for your help
Regards
Robert