unknown music file

i get file, "ATT05966", 2MB ,no extension, probably from mac user.
it's supposely music file... but i can't open,
i opened by text editor,
do you know what kind of file this is?
"    ftypM4A     M4A mp42isom      Sfmoov   lmvhd    ツ4敖
ツ4・  ャD D4                                             @                                I1trak   \tkhd   ツ4敖
ツ4・        D4                                              @             Hヘmdia    mdhd    ツ4敖
ツ4・  ャD D4 Uト     "hdlr        soun                Hノinf   smhd           $dinf   dref          url      HGstbl   gstsd          Wmp4a                     ャD     3esds    €€€"   €€€@   ・ ・€€€€€€   stts         "

"      pgap   data           tmpo   data            4ゥtoo   ,data       iTunes v7.0, QuickTime 7.1.3   シ----   mean    com.apple.iTunes   name    iTunSMPB   ・ata        00000000 00000840 00000018 0000000000442BA8 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000   「----   mean    com.apple.iTunes   name    iTunNORM   jdata        00000542 00000533 00001CEF 00001CF0 0000230A 0000230A 00006F38 00007129 0000078C 0000638C   f----   mean    com.apple.iTunes   name    iTunes_CDDB_1   )data       0800CC02+15496+2+150+7898   X----   mean    com.apple.iTunes   #name    iTunes_CDDB_TrackNumber   data       2  free "
Hiroyuki TamuraField EngineerAsked:
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☠ MASQ ☠Commented:
It looks like ITunes M4A header.  Was it sent as an attachment? If so looks like you have a problem with MAPI settings resulting in the file being renamed.  If you trust the source rename it to filename.MP4
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