Adaptive Multi-Rate files (AMRs) appear most often as voice recordings on cellphones. The format, developed by Ericsson, efficiently compresses the human voice in a small file size. In order to play your AMR files in Windows Media Player, you'll first need to convert them into a format the program supports, such as the Windows Media Audio (WMA) container. In order to complete this conversion, you can use an online converter like Media Converter, Zamzar, or Media-Convert.
Visit Media Converter (see Resources), click "Upload a file," pick your AMR file and click the "Arrow" button.
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Choose "WMA" as your target format and click the "Arrow" button.
Click "Start" to begin the conversion and "Download" to receive your WMA.
Visit Zamzar (see Resources) and click "Browse"/"Choose File" to pick your AMR.
Choose "WMA" as your target format and type your email address into the "E-mail" window.
Click "Convert" and open your email inbox. Once the conversion finishes, you'll receive an email housing your WMA download link.
Load Media-Convert (see Resources) and click "Browse"/"Choose File" to select your AMR.
Choose "Adaptive Multi-Rate (.amr)" as your input format and "ASF Audio (.asf,.wma)" as your output format in the drop-down menus.
Click "OK" to start the conversion and "Download" to receive your WMA.