Originally Posted by cybmole
Many program have a main association and also a backup association. e,g, excel opens .xlb as well as .xls. MS word also has a backup file type, & I am sure that a rummage though installed programs would find other examples...
Yes, but those extensions/associations are meaningfull to the program, as they are files produced by Excel/whatever. To open backup files produced by another
program is not a function, you'll find in many pieces of software.
Just my two pennies worth opinion