Smf extension stands for Standard MIDI files. You can try to open smf files by using Quicktime Player software.

These are the music files that work in a similar way with MID files. Smf files don`t include human voices. There are just music notes and note lengths. Smf files can be listened by Quicktime player. Quciktime is a free software. You may easily download Quicktime free from here:

Besides, there are different softwares which help you to open music notes. You can find via internet. 

What to use smf

Quicktime Player

which page related to smf file

smf Related Searches

You can check related links about smf fileextension.