These are icofiles (.ico) which can be used as shortcut icons
or as replacement folder icons.
All of the MLS teams, except The Revolution, have a primary logo and a secondary one. I designed a secondary logo icon for the Revolution just to make symmetrical layout for the set. Also, The 'Revolution' icon is different from the others in its format-- it's 32-bit with gradient transparency, the other team icons are 8-bit.