Things You'll Need
Instructions
Download Foobar2000 from foobar2000.org and install it on your computer.
Download the "foo_gep" plug-in from kode54.foobar2000.org. Extract the plug-in into your Foobar2000 components folder (i.e., *root folder*/FOOBAR2000/COMPONENTS).
Google search for "lame.exe" and select the link that reads "Download LAME MP3 Encoder" hosted by www.free-codecs.com. Download the Lame MP3 Encoder and install it onto your computer.
Open the NSF file in Foobar2000. The file will automatically begin playing. Select the song within the file that you want to convert.
Convert the song by right-clicking it and selecting "Convert." From the next options click "Convert to" which will open a new window. The new window's text field should read "(MP3 LAME) 245 kb."
Click "Okay" in this window, and save the file to destination folder you will remember. The song will then be converted to an MP3.