This is the modern version of the Acronis True Image backup format. It is designed for speed and incremental efficiency. However, it is proprietary , meaning you generally need Acronis software to read or extract it.
Simple copy/paste may fail on long file paths. Use Robocopy in Command Prompt: convert tibx to iso exclusive
Several tools and techniques can be used to convert TiB to ISO: This is the modern version of the Acronis