This is an audio container that can be opened using various programs and applications provided by Sony. W64 is often used for audio editing, as it supports the free frequency of data, as well as channels and bit depths. W64 files come in the 64-bit resolution. They can also be opened using certain programs on Windows, macOS, and Linux.

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.