Maybe your MP3 player does not support the file that includes multi byte characters (like Japanese) in the file name.
So would you change the name of the file and try again?
Anyway I uploaded another "Kaerou" zip. This zip includes revised "Kaerou" MP3 files. Also I renamed the files in single byte characters.
See renewed post about "Kaerou".
If you could not play revised file also, maybe it is owed to MP3 tag which includes multi byte characters. In case of that I would re-upload tag fixed version.
First of all, I would like to thank you for sharing all Hatsune Miku songs. I have seached and downloaded all possible link related to "Kaerou," however, I was unable to get a Karaoke or intrumental version of it. The MIku Hatsune's "Kaerou" Zipped mp3 file you provided is broken and the Karaoke version is unavailable now. Please help me or send me a link or mp3 file, and I would really appreciate it. Thank you again. Lonarsjojo@hotmail.com