Why won't the Sony Ericsson phone select songs as ringtones?

psych23232323

New member
My mom gave me this Sony Ericsson phone as a gift. It's a slider phone, green, has a walkman. It has this feature where I can download songs from my computer into the phone to listen to. I tried to select this song as a ringtone but it doesn't let me. Does anyone know why, the song is in MP3 format.
 
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