this forum is for problems or comments about the forums themselves.
You would be better off posting your question in a forum that deals with your particular OS, This one for instance.
File associations are generally based on the file extension, .txt, .doc, .xls, .jpg, etc.
Without that information, you will not have much success in getting an answer
How do I create a association for a file which allows me to oepn a e mail file. Thats the message I get from Hal when I try to open a file sent via e mail .