This is one of the most famous video and audio formats. Developed by Microsoft Corporation, the Audio Video Interleave format was released in 1992. It is supported by virtually all video players. AVI plays the sound and video simultaneously and is suitable for any browser. The compression process involves a variety of codecs. This format is very popular among users. Audio Video Interleave files can also be opened using Windows Media Player.

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.