We have found 2 software records in our database eligible for .m4r to .wma file format conversion.
To achieve m4t to wma conversion (ringtone export) You can use Xilisoft iPhone Ringtone Maker for Mac to transform Apple iPhone ringtone (.m4r) to Windows Media Audio (.wma).
Some other converters might also be of help here, but you might have to rename the extension from m4a to m4a first.
M4R
An m4r file extension is used for ringtones that is used by Apple iPhone. iPhone ringtones are stored in the same m4a audio format as songs. However m4r file extension is used to differentiate ringtones and songs.
WMA
Files with wma extension are audio files in Advanced Systems Format (advanced Streaming Format, Active Streaming Format), which is multimedia container format sed to store multimedia data. A wma file stores audio in Advanced Systems Format container and compressed by Windows Media Audio (WMA) codec.