https://community.sony.com.mk/t5/xperia-archive/walkman-app-m4a/m-p/3161949#M333238 I solved... Probably I mess up ripping files. After deleting, ripping once again and uploading Walkman is accepting m4a files. Fri, 10 Jan 2014 09:05:22 GMT TheMadcapLaughs 2014-01-10T09:05:22Z https://community.sony.com.mk/t5/xperia-archive/walkman-app-m4a/m-p/3161948#M333237 <P>Hello,</P><P>i'm new here and new to xperia world. Yesterday i've sync my itunes library through bridge but when trying to play songs through Walkman or Apollo i get an error.</P><P>I searched on the forum and found another user with different handset (xperia S) having same issue and most of you answered that no problem faced while playing apple format.</P><P>What could i check? any idea?</P><P>In the meanwhile, i installed poweramp that i had on my previous phone and no problem reading imported files. But, i would like to use Walkman because i don't like poweramp GUI.</P><P>Thanks in advance,</P><P>Mad/</P> Thu, 09 Jan 2014 09:25:23 GMT https://community.sony.com.mk/t5/xperia-archive/walkman-app-m4a/m-p/3161948#M333237 TheMadcapLaughs 2014-01-09T09:25:23Z https://community.sony.com.mk/t5/xperia-archive/walkman-app-m4a/m-p/3161949#M333238 I solved... Probably I mess up ripping files. After deleting, ripping once again and uploading Walkman is accepting m4a files. Fri, 10 Jan 2014 09:05:22 GMT https://community.sony.com.mk/t5/xperia-archive/walkman-app-m4a/m-p/3161949#M333238 TheMadcapLaughs 2014-01-10T09:05:22Z