The company Central Point Software released Transcopy with their Option/Deluxe Option boards.  It was pretty much solely programmed by Alan J Silver. Unfortunately little information exists today about the format and inner workings. Alan Silver sadly died in 1991 of melanoma taking his knowledge to the grave. There is a small community that exists today dedicated to preserving original floppy disks and they still use this format as its very fast and versatile. I’ll try and compile as much information as possible about the file format and inner workings.