Dear MicroK-Went to the FAQS and tried the first suggestion of downloading a program to decode a possible codec in my AV file-Site is temporarily down so I will try (and try again!) later.Went to reassociate the file type (although it was on extension :MES,MIME application-a2b music,Opens with Real JBX) and discovered that I also have Quicktime and Windows Media Player there also.But any of these SHOULD work ,correct?I will try to reassociate to Windows Media and see if that helps.I make microprocessors for a living and Limewire 1.4 gave me NO problems!Any help is greatly appreciated!Sincerely-Gearhead