You need to convert the files to a more mainstream format such as MP3. If you don't have a converter, I'd be happy to batch convert them for you. You can of course, buy a converter on-line. However, I'd be happy to save you this expense if you don't want to buy one. If you want me to convert them let me know and I will send you some simple instructions and passwords for uploading the *.amr files to our secure server. You will receive a link back to download the MP3s. Alternatively, if you use Dropbox, we can simply share a folder and I will convert the files for you in that folder. You original *.amr files will also remain in the folder.
Hope this helps!