The Waveform Audio file format is a creation of Microsoft Corporation. The WAV format is the first standard audio file with high-quality sound. It contains sounds, sound effects, voice recordings, and music tracks. The Waveform Audio file format is currently considered outdated. The main reason for its obsoletion is the fact that files of this type are characterized by a large size. The greatest advantage of WAV is sound compression without any losses. In this format, samples range from 8 to 16 bits. Waveform Audio files are used as system sounds in the Windows operating system.

spx

An audio file with recorded voice messages

This format extension is one of the Speex Audio formats. It is an open-source codec developed by Xiph.Org. Used for creating voice messages and transmitting voice over packet-based networks with a low level of security. It is an audio file with recorded voice messages that are packaged in an OGG file. Only certain media players can open it.