Files that contain the .jpx file extension are normally associated with JPEG 2000 files. The JPEG 2000 file format is an improved version of the traditional JPEG-1 file format.
Like the JPEG-1 file format, the JPEG 2000 file format allows for image transparency and the retention of alpha spot channels, however, the JPX files can also contain additional metadata within the files that describe the contents of the file, such as the resolution of the image and the color space that is used to encode the image.
The JBuilder software application also uses the .jpx file suffix. This software uses the .jpx file extension for project files that are created by the program.
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If you have additional information about the JPX file format or software that uses files with the JPX suffix, please do get in touch - we would love hearing from you.