What is RA file? 

RA is the file extension for the RealMedia streaming audio container format developed by RealNetworks.

RealAudio
File extension: .ra
MIME type: audio/vnd.rn-realaudio, audio/x-pn-realaudio, audio/x-realaudio, audio/x-pm-realaudio-plugin, video/x-pn-realvideo
Developed by: RealNetworks
Type of format: audio file format

What is WMA file?

Windows Media Audio
File extension: .wma
MIME type: audio/x-ms-wma
Uniform Type Identifier: com.microsoft.windows-​media-wma
Developed by: Microsoft
Type of format: audio file format

Convert RA to WMA with Mini-stream Ripper