What is the filename .ext ension ?
If it is
.sit
as a guess, than you need
Stuffit which is a file compression program...
You can download it by clicking on the
.sit Files ? link in my 'sig' below...
I mention .sit files only because it's a fairly logical guess and giving you at least that info now may speed things for you...
Obviously, if it's a different file type, come back and ask for more help...
