AIFF is Audio Interchange File Format. AIF is the standard audio format for Apple Computer belonging to one part of QuickTime technology. As Apple computer is mostly applied to multimedia publishing industry, AIFF audio files are supported by almost all audio editor software and audio player software more or less. So there must be a world for AIFF as long as Apple Computer still exists. AIFC is file extension for AIF.

WMA is Windows Media Audio. WMA is a new audio format developed by Microsoft well known as MP3. With a higher rate in files compression and better sound quality than the latter, even far beyond those of RA.

There is an aiff decoder in Windows, you can convert aif/aifc/aiff to wma file,  

Download WMA Converter which can convert aif to wma file. Select an aifc file, set the start time, the end time or audio encoding bitrate if needed. The bitrate is bigger, the file size is bigger, the audio quality is higher, and vice versa. Click the Convert button to convert aif to wma.

SpeeX is a free software speech codec which declares to be free from any patent restrictions. It aims to to make a codec that would be optimized for high quality speech and low bit rate by adopting wide range of bit rates and supporting ultra-wideband mode at 32 kHz (up to 48 kHz). Being robust to lost packets but not to corrupted ones, Speex may be directly transmitted over UDP/RTP or used with the Ogg container format. *.spx is the file extension of Speex.

Please install Speex codec to convert spx to wma.

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