These are Equalizer (EQ) presets for use with the foobar2000 desktop media player for Windows. They appear to be old Winamp presets, I'm sure they'd work there as well.
Equalizer Presets for foobar2000
These are Equalizer (EQ) presets for use with the foobar2000 desktop media player for Windows. They appear to be old Winamp presets, I'm sure they'd work there as well.