.AX File Extension
File TypeDirectShow Filter
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
Used by various video playback programs to process video data streams; provides decoding and encoding capabilities, file parsing, audio and video de-multiplexing, video decompression, and rendering of video files; may also be used in the video recording and editing process.
DirectShow is sometimes referred to as "Quartz" and was developed as a replacement for Microsoft's "Video for Windows" format.