On the Windows platform you must include a file type extension at the end of the file name when recording to a file or converting a sound to a file. The file type extension must match the sound type. On the Mac, adding a file type extension to the file name is optional.

On both platforms, Audio Xtra tries to interpret a sound file in the format specified by the extension. If a sound file name has the wrong extension, for instance if an AIFF file is named SOUND.WAV, Audio Xtra will not be able to play or otherwise work with the file.