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you have connected your cad to infected PC. It is type of virus which makes files in every external driver in every folder (approximetelly 250KB 160~350kb) and this file is virus of course. have folder mark but is executable and after execute also makes "its clones".
If you can access simply delete this file, also update your antivirus software for latest updates to prevent unwanted softs.
if suddenly your mobile option you, "Playback failed", that means the phone can not locate the file where it was placed, mostly this problem prisist, when you are using low quality 1 GB memory stick, then it is understood that the file which is bieng played, is moved or the phone is unable to locate the desired file.
mostly for such memory sticks phone lost the files, its solution is remove the memory stick and restart the phone or try formating the memory stick several time from the phone.
What format are they? I don't think the Walkman will play M4a (iPod) files. You're best-off with Mp3 files at a bit-rate of 128mbps or 192mbps. I'm not sure if it can handle "lossless" quality music files.