With what program do you open a .msf file?

Factual Questions
1

What program opens a .msf?

[grump]It’s got the MicroSoft flag in front of it, can’t a Microsoft program figure this out? [/grump]

2

Accoarding to FILExt.com, it could be an Earthlink mail file. Other possibilities on this page as well.

3

Thank you! That site is now on my Favorites.